diff --git a/.gitignore b/.gitignore
index e2a1faa..ca05913 100644
--- a/.gitignore
+++ b/.gitignore
@@ -132,3 +132,4 @@ Homestead.json
 .env*.local
 .vercel
 next-env.d.ts
+
diff --git a/LICENSE.md b/LICENSE.md
index 1272de8..bffa737 100644
--- a/LICENSE.md
+++ b/LICENSE.md
@@ -1,6 +1,6 @@
 MIT License
 
-Copyright (c) 2023 Ismo Vuorinen
+Copyright (c) 2024 Ismo Vuorinen
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..3e38027
--- /dev/null
+++ b/README.md
@@ -0,0 +1,38 @@
+# Business Data Fetcher
+
+This is an API client to Finnish Patent and Registration
+Office's (PRH) Business Information System (BIS).
+
+Use it to get company data from the Business Information System by Business ID.
+
+## Installation
+
+```bash
+composer install ivuorinen/business-data-fetcher
+```
+
+## Usage example
+
+```php
+<?php
+require_once 'vendor/autoload.php';
+
+$client  = new Ivuorinen\BusinessDataFetcher\BusinessDataFetcher();
+try {
+    $results = $client->getBusinessInformation('1639413-9');
+    print_r($results);
+} catch (\GuzzleHttp\Exception\GuzzleException $e) {
+    var_dump($e);
+}
+```
+
+## Data source
+
+All models are transcribed from PRH Open Data portal. You can find the examples
+and models descriptions, among other details and live API query tool following
+this link: https://avoindata.prh.fi/ytj_en.html
+
+## Notice of Liability
+
+The data provided by the API is subject to change without warning and the author(s)
+of this library are providing this without compensation and cannot be held responsible.
diff --git a/composer.json b/composer.json
new file mode 100644
index 0000000..d6a8fac
--- /dev/null
+++ b/composer.json
@@ -0,0 +1,16 @@
+{
+    "name": "ivuorinen/business-data-fetcher",
+    "description": "Library to fetch finnish business data",
+    "type": "library",
+    "license": "MIT",
+    "require": {
+        "php": "^8",
+        "guzzlehttp/guzzle": "7.4.5",
+        "spatie/data-transfer-object": "^3.9"
+    },
+    "autoload": {
+        "psr-4": {
+            "Ivuorinen\\BusinessDataFetcher\\": "src/"
+        }
+    }
+}
diff --git a/composer.lock b/composer.lock
new file mode 100644
index 0000000..380a928
--- /dev/null
+++ b/composer.lock
@@ -0,0 +1,675 @@
+{
+    "_readme": [
+        "This file locks the dependencies of your project to a known state",
+        "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
+        "This file is @generated automatically"
+    ],
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+                    "email": "mtdowling@gmail.com",
+                    "homepage": "https://github.com/mtdowling"
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+                    "email": "jeremeamia@gmail.com",
+                    "homepage": "https://github.com/jeremeamia"
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+                    "name": "George Mponos",
+                    "email": "gmponos@gmail.com",
+                    "homepage": "https://github.com/gmponos"
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+                    "name": "Tobias Nyholm",
+                    "email": "tobias.nyholm@gmail.com",
+                    "homepage": "https://github.com/Nyholm"
+                },
+                {
+                    "name": "Márk Sági-Kazár",
+                    "email": "mark.sagikazar@gmail.com",
+                    "homepage": "https://github.com/sagikazarmark"
+                },
+                {
+                    "name": "Tobias Schultze",
+                    "email": "webmaster@tubo-world.de",
+                    "homepage": "https://github.com/Tobion"
+                }
+            ],
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+        },
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+                    "email": "mtdowling@gmail.com",
+                    "homepage": "https://github.com/mtdowling"
+                },
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+                    "email": "tobias.nyholm@gmail.com",
+                    "homepage": "https://github.com/Nyholm"
+                },
+                {
+                    "name": "Tobias Schultze",
+                    "email": "webmaster@tubo-world.de",
+                    "homepage": "https://github.com/Tobion"
+                }
+            ],
+            "description": "Guzzle promises library",
+            "keywords": [
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+            ],
+            "support": {
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+                "source": "https://github.com/guzzle/promises/tree/1.5.3"
+            },
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+                    "type": "github"
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+                    "type": "tidelift"
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+                "url": "https://github.com/guzzle/psr7.git",
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+            },
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+                }
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+                    "homepage": "https://github.com/mtdowling"
+                },
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+                    "name": "George Mponos",
+                    "email": "gmponos@gmail.com",
+                    "homepage": "https://github.com/gmponos"
+                },
+                {
+                    "name": "Tobias Nyholm",
+                    "email": "tobias.nyholm@gmail.com",
+                    "homepage": "https://github.com/Nyholm"
+                },
+                {
+                    "name": "Márk Sági-Kazár",
+                    "email": "mark.sagikazar@gmail.com",
+                    "homepage": "https://github.com/sagikazarmark"
+                },
+                {
+                    "name": "Tobias Schultze",
+                    "email": "webmaster@tubo-world.de",
+                    "homepage": "https://github.com/Tobion"
+                },
+                {
+                    "name": "Márk Sági-Kazár",
+                    "email": "mark.sagikazar@gmail.com",
+                    "homepage": "https://sagikazarmark.hu"
+                }
+            ],
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+            "keywords": [
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+                "message",
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+        },
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+            },
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+            },
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+            "version": "1.1.0",
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+                    "Psr\\Http\\Message\\": "src/"
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+            "notification-url": "https://packagist.org/downloads/",
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+                    "url": "https://spatie.be/open-source/support-us",
+                    "type": "custom"
+                },
+                {
+                    "url": "https://github.com/spatie",
+                    "type": "github"
+                }
+            ],
+            "abandoned": "spatie/laravel-data",
+            "time": "2022-09-16T13:34:38+00:00"
+        },
+        {
+            "name": "symfony/deprecation-contracts",
+            "version": "v3.5.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/symfony/deprecation-contracts.git",
+                "reference": "0e0d29ce1f20deffb4ab1b016a7257c4f1e789a1"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/symfony/deprecation-contracts/zipball/0e0d29ce1f20deffb4ab1b016a7257c4f1e789a1",
+                "reference": "0e0d29ce1f20deffb4ab1b016a7257c4f1e789a1",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=8.1"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-main": "3.5-dev"
+                },
+                "thanks": {
+                    "name": "symfony/contracts",
+                    "url": "https://github.com/symfony/contracts"
+                }
+            },
+            "autoload": {
+                "files": [
+                    "function.php"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Nicolas Grekas",
+                    "email": "p@tchwork.com"
+                },
+                {
+                    "name": "Symfony Community",
+                    "homepage": "https://symfony.com/contributors"
+                }
+            ],
+            "description": "A generic function and convention to trigger deprecation notices",
+            "homepage": "https://symfony.com",
+            "support": {
+                "source": "https://github.com/symfony/deprecation-contracts/tree/v3.5.0"
+            },
+            "funding": [
+                {
+                    "url": "https://symfony.com/sponsor",
+                    "type": "custom"
+                },
+                {
+                    "url": "https://github.com/fabpot",
+                    "type": "github"
+                },
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/symfony/symfony",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2024-04-18T09:32:20+00:00"
+        }
+    ],
+    "packages-dev": [],
+    "aliases": [],
+    "minimum-stability": "stable",
+    "stability-flags": [],
+    "prefer-stable": false,
+    "prefer-lowest": false,
+    "platform": {
+        "php": "^8"
+    },
+    "platform-dev": [],
+    "plugin-api-version": "2.6.0"
+}
diff --git a/example.php b/example.php
new file mode 100644
index 0000000..28938a8
--- /dev/null
+++ b/example.php
@@ -0,0 +1,11 @@
+<?php
+
+require_once 'vendor/autoload.php';
+
+$client  = new Ivuorinen\BusinessDataFetcher\BusinessDataFetcher();
+try {
+    $results = $client->getBusinessInformation('1639413-9');
+    print_r($results);
+} catch (\GuzzleHttp\Exception\GuzzleException $e) {
+    var_dump($e);
+}
diff --git a/gen/models.txt b/gen/models.txt
new file mode 100644
index 0000000..10aec05
--- /dev/null
+++ b/gen/models.txt
@@ -0,0 +1,122 @@
+BisCompanyDetails {
+    names (Array[BisCompanyName]): Primary company name and translations
+    auxiliaryNames (Array[BisCompanyName], optional): Auxiliary company name and translations
+    addresses (Array[BisAddress], optional): Company's street and postal addresses
+    companyForms (Array[BisCompanyForm], optional): Company form and translations
+    liquidations (Array[BisCompanyLiquidation], optional): Bankruptcy, liquidation or restructuring proceedings
+    businessLines (Array[BisCompanyBusinessLine], optional): Company's lines of business and translations
+    languages (Array[BisCompanyLanguage], optional): Company's language(s)
+    registeredOffices (Array[BisCompanyRegisteredOffice], optional): Company's place of registered office and its translations
+    contactDetails (Array[BisCompanyContactDetail], optional): Company's contact details and translations
+    registeredEntries (Array[BisCompanyRegisteredEntry], optional): Company's registered entries
+    businessIdChanges (Array[BisCompanyBusinessIdChange], optional): Company's Business ID changes
+    businessId (string): Business ID
+    registrationDate (string): Date of registration
+    companyForm (string, optional): Company form
+    detailsUri (string, optional): A URI for more details, if details aren't already included
+    name (string): Primary company name
+}
+
+BisCompanyName {
+    source (integer, optional): Zero for common, one for Finnish Patent and Registration Office, two for Tax Administration or three for Business Information System
+    order (integer): Zero for primary company name, other for translations of the primary company name and auxiliary company names
+    version (integer): One for current version and >1 for historical company names
+    registrationDate (string): Date of registration
+    endDate (string, optional): Ending date of registration
+    name (string): Company name
+    language (string, optional): Two letter language code
+}
+
+BisAddress {
+    source (integer, optional): Zero for common, one for Finnish Patent and Registration Office, two for Tax Administration or three for Business Information System
+    version (integer): One for current version and >1 for historical addresses
+    registrationDate (string): Date of registration
+    endDate (string, optional): Ending date of registration
+    careOf (string, optional): Care of address
+    street (string, optional): Street address
+    postCode (string, optional): ZIP code
+    city (string, optional): City of address
+    language (string, optional): Two letter language code
+    type (integer): Type of address, 1 for street address, 2 for postal address
+    country (string, optional): Two letter country code
+}
+
+BisCompanyForm {
+    source (integer, optional): Zero for common, one for Finnish Patent and Registration Office, two for Tax Administration or three for Business Information System
+    version (integer): One for current version and >1 for historical company forms
+    registrationDate (string): Date of registration
+    endDate (string, optional): Ending date of registration
+    name (string): Name of company form
+    language (string, optional): Two letter language code
+    type (string): Type of company form
+}
+
+BisCompanyLiquidation {
+    source (integer, optional): Zero for common, one for Finnish Patent and Registration Office, two for Tax Administration or three for Business Information System
+    version (integer): One for current version and >1 for historical company forms
+    registrationDate (string): Date of registration
+    endDate (string, optional): Ending date of registration
+    name (string): Bankruptcy, liquidation or restructuring proceedings
+    language (string, optional): Two letter language code
+    type (string): Type of liquidation
+}
+
+BisCompanyBusinessLine {
+    source (integer, optional): Zero for common, one for Finnish Patent and Registration Office, two for Tax Administration or three for Business Information System
+    order (integer): Zero for main line of business, positive for others
+    version (integer): One for current version and >1 for historical lines of business
+    registrationDate (string): Date of registration
+    endDate (string, optional): Ending date of registration
+    name (string): Name of line of business
+    language (string, optional): Two letter language code
+}
+
+BisCompanyLanguage {
+    source (integer, optional): Zero for common, one for Finnish Patent and Registration Office, two for Tax Administration or three for Business Information System
+    version (integer): One for current version and >1 for historical languages
+    registrationDate (string): Date of registration
+    endDate (string, optional): Ending date of registration
+    name (string): Name of language
+    language (string, optional): Two letter language code
+}
+
+BisCompanyRegisteredOffice {
+    source (integer, optional): Zero for common, one for Finnish Patent and Registration Office, two for Tax Administration or three for Business Information System
+    order (integer): Zero for primary place of registered office, positive for others
+    version (integer): One for current version and >1 for historical places of registered office
+    registrationDate (string): Date of registration
+    endDate (string, optional): Ending date of registration
+    name (string): Name of place of registered office
+    language (string, optional): Two letter language code
+}
+
+BisCompanyContactDetail {
+    source (integer, optional): Zero for common, one for Finnish Patent and Registration Office, two for Tax Administration or three for Business Information System
+    version (integer): One for current version and >1 for historical contact details
+    registrationDate (string): Date of registration
+    endDate (string, optional): Ending date of registration
+    language (string, optional): Two letter language code
+    value (string): Value of contact detail
+    type (string): Type of contact detail
+}
+
+BisCompanyRegisteredEntry {
+    description (string): Description of entry
+    status (integer): Zero for common entries, one for ‘Unregistered’ and two for ‘Registered’
+    registrationDate (string): Date of registration
+    endDate (string, optional): Ending date of registration
+    register (integer): One for Trade Register, two for Register of Foundations, three for Register of Associations, four for Tax Administration, five for Prepayment Register, six for VAT Register, seven for Employer Register and eight for register of bodies liable for tax on insurance premiums
+    language (string, optional): Two letter language code
+    authority (integer): One for Tax Administration, two for Finnish Patent and Registration Office and three for Population Register
+}
+
+BisCompanyBusinessIdChange {
+    source (integer, optional): Zero for common, one for Finnish Patent and Registration Office, two for Tax Administration or three for Business Information System
+    description (string): Description of reason
+    reason (string): Reason code
+    changeDate (string, optional): Date of Business ID change
+    change (integer): 2 = Business ID removal,3 = Combining of double IDs,5 = ID changed,44 = Fusion,45 = Operator continuing VAT activities,46 = Relation to predecessor,47 = Division,48 = Bankruptcy relationship,49 = Operations continued by a private trader,57 = Partial division,DIF = Division,FUU = Fusion
+    oldBusinessId (string): Old Business ID
+    newBusinessId (string): New Business ID
+    language (string, optional): Two letter language code
+}
diff --git a/gen/parser.php b/gen/parser.php
new file mode 100644
index 0000000..457aa7d
--- /dev/null
+++ b/gen/parser.php
@@ -0,0 +1,56 @@
+<?php
+
+// Load models.txt that contains https://avoindata.prh.fi/ytj_en.html models.
+// Just copy and paste the plaintext Response Class contents to the file and
+// run this file: php parser.php
+$models = file_get_contents(sprintf(
+    '%s%2$smodels.txt',
+    __DIR__,
+    DIRECTORY_SEPARATOR
+));
+
+// Capture the names as one group,
+// and blocks inside curly braces as another,
+// then combine them later.
+preg_match_all('/(\w+)\s\{([\w\W]*?)\}/m', $models, $output_array);
+
+[$all, $names, $fields] = $output_array;
+
+$fields = array_map(
+    function ($f) {
+        $f = explode("\n", $f);
+        $f = array_map('trim', $f);
+        $f = array_filter($f);
+
+        $f = array_map(function ($field) {
+            [$name_and_type, $docs] = explode(':', $field, 2);
+            $names_and_types = explode(' ', $name_and_type, 2);
+
+            [$name, $type] = $names_and_types;
+
+            $type = str_replace(['(', ')'], '', $type);
+
+            if (str_contains($type, 'optional')) {
+                $type = str_replace(['optional', ','], '', $type);
+                $type = '?' . trim($type);
+            }
+
+            return [
+                $name => [
+                    'name' => trim($name),
+                    'type' => trim($type),
+                    'docs' => trim($docs),
+                ],
+            ];
+        }, $f ?? []);
+
+        $f = array_merge(...$f);
+
+        return $f;
+    },
+    $fields
+);
+
+$classes = array_combine($names, $fields);
+
+print_r($classes);
diff --git a/src/BusinessDataFetcher.php b/src/BusinessDataFetcher.php
new file mode 100644
index 0000000..e926ed9
--- /dev/null
+++ b/src/BusinessDataFetcher.php
@@ -0,0 +1,93 @@
+<?php
+
+namespace Ivuorinen\BusinessDataFetcher;
+
+use GuzzleHttp\Client;
+use GuzzleHttp\Exception\RequestException;
+use Ivuorinen\BusinessDataFetcher\Dto\BisCompanyDetails;
+use Ivuorinen\BusinessDataFetcher\Exceptions\ApiResponseErrorException;
+
+/**
+ * Fetches and returns business data from avoindata
+ */
+class BusinessDataFetcher
+{
+    /**
+     * @var \GuzzleHttp\Client
+     */
+    private Client $httpClient;
+
+    /**
+     * BusinessDataFetcher constructor.
+     */
+    public function __construct()
+    {
+        $this->httpClient = new Client([
+            'base_uri' => 'https://avoindata.prh.fi',
+            'timeout'  => 2,
+        ]);
+    }
+
+    /**
+     * Fetch Business Information.
+     *
+     * @param string $businessId
+     *
+     * @return array $response_data
+     * @throws \Exception|\GuzzleHttp\Exception\GuzzleException
+     */
+    public function getBusinessInformation(string $businessId): array
+    {
+        // Set request variables
+        $requestUrl    = '/bis/v1';
+        $response_data = [];
+
+        // Get the business data
+        try {
+            $uri      = $requestUrl . '/' . $businessId;
+            $response = $this->httpClient->get($uri);
+
+            if ($response->getStatusCode() !== 200) {
+                throw new ApiResponseErrorException(
+                    $response->getReasonPhrase(),
+                    $response->getStatusCode()
+                );
+            }
+
+            $response_data = $this->parse_response($response);
+        } catch (RequestException $exception) {
+            throw new ApiResponseErrorException(
+                $exception->getMessage(),
+                $exception->getCode(),
+                $exception
+            );
+        }
+
+        return $response_data;
+    }
+
+    /**
+     * @param \Psr\Http\Message\ResponseInterface $response
+     *
+     * @return array
+     * @throws \JsonException
+     * @throws \Spatie\DataTransferObject\Exceptions\UnknownProperties
+     */
+    public function parse_response(\Psr\Http\Message\ResponseInterface $response): array
+    {
+        $data = json_decode(
+            $response->getBody()->getContents(),
+            true,
+            512,
+            JSON_THROW_ON_ERROR
+        );
+
+        $results = [];
+
+        foreach ($data['results'] as $result) {
+            $results[] = new BisCompanyDetails($result);
+        }
+
+        return $results;
+    }
+}
diff --git a/src/Dto/BisAddress.php b/src/Dto/BisAddress.php
new file mode 100644
index 0000000..f2c4f64
--- /dev/null
+++ b/src/Dto/BisAddress.php
@@ -0,0 +1,83 @@
+<?php
+
+namespace Ivuorinen\BusinessDataFetcher\Dto;
+
+use Ivuorinen\BusinessDataFetcher\Traits\HasSource;
+use Spatie\DataTransferObject\DataTransferObject;
+
+/**
+ * Business Address
+ *
+ * - careOf (string, optional): Care of address
+ * - street (string, optional): Street address
+ * - postCode (string, optional): ZIP code
+ * - city (string, optional): City of address
+ * - language (string, optional): Two letter language code
+ * - type (integer): Type of address, 1 for street address, 2 for postal address
+ * - country (string, optional): Two letter country code
+ */
+class BisAddress extends DataTransferObject
+{
+    use HasSource;
+
+    /**
+     * One for current version and >1 for historical company names
+     *
+     * @var int
+     */
+    public int $version;
+    /**
+     * Date of registration
+     *
+     * @var string
+     */
+    public string $registrationDate = '';
+    /**
+     * Ending date of registration
+     *
+     * @var string|null
+     */
+    public ?string $endDate = null;
+    /**
+     * Care of address (c/o)
+     *
+     * @var string|null
+     */
+    public ?string $careOf;
+    /**
+     * Street address
+     *
+     * @var string|null
+     */
+    public ?string $street;
+    /**
+     * ZIP code
+     *
+     * @var string|null
+     */
+    public ?string $postCode;
+    /**
+     * City of address
+     *
+     * @var string|null
+     */
+    public ?string $city;
+    /**
+     * Two letter language code
+     *
+     * @var string|null
+     */
+    public ?string $language;
+    /**
+     * Type of address, 1 for street address, 2 for postal address
+     *
+     * @var int
+     */
+    public int $type;
+    /**
+     * Two-letter country code
+     *
+     * @var string|null
+     */
+    public ?string $country;
+}
diff --git a/src/Dto/BisCompanyBusinessIdChange.php b/src/Dto/BisCompanyBusinessIdChange.php
new file mode 100644
index 0000000..59b14c8
--- /dev/null
+++ b/src/Dto/BisCompanyBusinessIdChange.php
@@ -0,0 +1,34 @@
+<?php
+
+namespace Ivuorinen\BusinessDataFetcher\Dto;
+
+use Ivuorinen\BusinessDataFetcher\Traits\HasSource;
+use Spatie\DataTransferObject\DataTransferObject;
+
+/**
+ * Company Business ID Change
+ *
+ * - description (string): Description of reason
+ * - reason (string): Reason code
+ * - changeDate (string, optional): Date of Business ID change
+ * - change (integer):
+ *      2 = Business ID removal,
+ *      3 = Combining of double IDs,
+ *      5 = ID changed,
+ *      44 = Fusion,
+ *      45 = Operator continuing VAT activities,
+ *      46 = Relation to predecessor,
+ *      47 = Division,
+ *      48 = Bankruptcy relationship,
+ *      49 = Operations continued by a private trader,
+ *      57 = Partial division,
+ *      DIF = Division,
+ *      FUU = Fusion
+ * - oldBusinessId (string): Old Business ID
+ * - newBusinessId (string): New Business ID
+ * - language (string, optional): Two letter language code
+ */
+class BisCompanyBusinessIdChange extends DataTransferObject
+{
+    use HasSource;
+}
diff --git a/src/Dto/BisCompanyBusinessLine.php b/src/Dto/BisCompanyBusinessLine.php
new file mode 100644
index 0000000..9cb82af
--- /dev/null
+++ b/src/Dto/BisCompanyBusinessLine.php
@@ -0,0 +1,64 @@
+<?php
+
+namespace Ivuorinen\BusinessDataFetcher\Dto;
+
+use Ivuorinen\BusinessDataFetcher\Traits\HasSource;
+use Spatie\DataTransferObject\DataTransferObject;
+
+/**
+ * Company Business Line
+ *
+ * - order (integer): Zero for main line of business, positive for others
+ * - version (integer):
+ *      One for current version and
+ *      >1 for historical lines of business
+ * - registrationDate (string): Date of registration
+ * - endDate (string, optional): Ending date of registration
+ * - name (string): Name of line of business
+ * - language (string, optional): Two letter language code
+ */
+class BisCompanyBusinessLine extends DataTransferObject
+{
+    use HasSource;
+
+    /**
+     * Order
+     *
+     * Zero for primary company name,
+     * other for translations of the primary company name
+     * and auxiliary company names
+     *
+     * @var int
+     */
+    public int $order;
+    /**
+     * One for current version and >1 for historical company names
+     *
+     * @var int
+     */
+    public int $version;
+    /**
+     * Date of registration
+     *
+     * @var string
+     */
+    public string $registrationDate = '';
+    /**
+     * Ending date of registration
+     *
+     * @var string|null
+     */
+    public ?string $endDate = null;
+    /**
+     * Name of line of business
+     *
+     * @var string
+     */
+    public string $name;
+    /**
+     * Two letter language code
+     *
+     * @var string|null
+     */
+    public ?string $language = null;
+}
diff --git a/src/Dto/BisCompanyContactDetail.php b/src/Dto/BisCompanyContactDetail.php
new file mode 100644
index 0000000..040ea20
--- /dev/null
+++ b/src/Dto/BisCompanyContactDetail.php
@@ -0,0 +1,51 @@
+<?php
+
+namespace Ivuorinen\BusinessDataFetcher\Dto;
+
+use Ivuorinen\BusinessDataFetcher\Traits\HasSource;
+use Spatie\DataTransferObject\DataTransferObject;
+
+/**
+ * Company Contact Detail
+ */
+class BisCompanyContactDetail extends DataTransferObject
+{
+    use HasSource;
+
+    /**
+     * One for current version and >1 for historical contact details
+     *
+     * @var int
+     */
+    public int $version;
+    /**
+     * Date of registration
+     *
+     * @var string
+     */
+    public string $registrationDate;
+    /**
+     * Ending date of registration
+     *
+     * @var string|null
+     */
+    public ?string $endDate;
+    /**
+     * Two letter language code
+     *
+     * @var string
+     */
+    public string $language;
+    /**
+     * Value of contact detail
+     *
+     * @var string
+     */
+    public string $value;
+    /**
+     * Type of contact detail
+     *
+     * @var string
+     */
+    public string $type;
+}
diff --git a/src/Dto/BisCompanyDetails.php b/src/Dto/BisCompanyDetails.php
new file mode 100644
index 0000000..dd9f176
--- /dev/null
+++ b/src/Dto/BisCompanyDetails.php
@@ -0,0 +1,132 @@
+<?php
+
+namespace Ivuorinen\BusinessDataFetcher\Dto;
+
+use Spatie\DataTransferObject\Attributes\CastWith;
+use Spatie\DataTransferObject\Casters;
+use Spatie\DataTransferObject\DataTransferObject;
+
+/**
+ * Company Details
+ */
+class BisCompanyDetails extends DataTransferObject
+{
+    /**
+     * Business ID
+     *
+     * @var string
+     */
+    public string $businessId;
+    /**
+     * Primary company name
+     *
+     * @var string
+     */
+    public string $name;
+    /**
+     * Date of registration
+     *
+     * @var string
+     */
+    public string $registrationDate;
+    /**
+     * Company form
+     *
+     * @var string|null
+     */
+    public ?string $companyForm = null;
+    /**
+     * A URI for more details, if details aren't already included
+     *
+     * @var string|null
+     */
+    public ?string $detailsUri = null;
+
+    /**
+     * Primary company name and translations
+     *
+     * @var BisCompanyName[] $names
+     */
+    #[CastWith(Casters\ArrayCaster::class, itemType: BisCompanyName::class)]
+    public ?array $names = null;
+
+    /**
+     * Auxiliary company name and translations
+     *
+     * @var BisCompanyName[] $auxiliaryNames
+     */
+    #[CastWith(Casters\ArrayCaster::class, itemType: BisCompanyName::class)]
+    public ?array $auxiliaryNames = null;
+
+    /**
+     * Company's street and postal addresses
+     *
+     * @var BisAddress[]|null $addresses
+     */
+    #[CastWith(Casters\ArrayCaster::class, itemType: BisAddress::class)]
+    public ?array $addresses = null;
+
+    /**
+     * Company form and translations
+     *
+     * @var BisCompanyForm[]|null $companyForms
+     */
+    #[CastWith(Casters\ArrayCaster::class, itemType: BisCompanyForm::class)]
+    public ?array $companyForms = null;
+
+    /**
+     * Bankruptcy, liquidation or restructuring proceedings
+     *
+     * @var BisCompanyLiquidation[]|null $liquidations
+     */
+    #[CastWith(Casters\ArrayCaster::class, itemType: BisCompanyLiquidation::class)]
+    public ?array $liquidations = null;
+
+    /**
+     * Company's lines of business and translations
+     *
+     * @var BisCompanyBusinessLine[]|null $businessLines
+     */
+    #[CastWith(Casters\ArrayCaster::class, itemType: BisCompanyBusinessLine::class)]
+    public ?array $businessLines = null;
+
+    /**
+     * Company's language(s)
+     *
+     * @var BisCompanyLanguage[]|null $languages
+     */
+    #[CastWith(Casters\ArrayCaster::class, itemType: BisCompanyLanguage::class)]
+    public ?array $languages = null;
+
+    /**
+     * Company's place of registered office and its translations
+     *
+     * @var BisCompanyRegisteredOffice[]|null $registeredOffices
+     */
+    #[CastWith(Casters\ArrayCaster::class, itemType: BisCompanyRegisteredOffice::class)]
+    public ?array $registeredOffices = null;
+
+    /**
+     * Company's contact details and translations
+     *
+     * @var BisCompanyContactDetail[]|null $contactDetails
+     */
+    #[CastWith(Casters\ArrayCaster::class, itemType: BisCompanyContactDetail::class)]
+    public ?array $contactDetails = null;
+
+    /**
+     * Company's registered entries
+     *
+     * @var BisCompanyRegisteredEntry[]|null $registeredEntries
+     */
+    #[CastWith(Casters\ArrayCaster::class, itemType: BisCompanyRegisteredEntry::class)]
+    public ?array $registeredEntries = null;
+
+    /**
+     * Company's Business ID changes
+     *
+     * @var BisCompanyBusinessIdChange[]|null $businessIdChanges
+     */
+    #[CastWith(Casters\ArrayCaster::class, itemType: BisCompanyBusinessIdChange::class)]
+    public ?array $businessIdChanges = null;
+}
diff --git a/src/Dto/BisCompanyForm.php b/src/Dto/BisCompanyForm.php
new file mode 100644
index 0000000..f4e024e
--- /dev/null
+++ b/src/Dto/BisCompanyForm.php
@@ -0,0 +1,54 @@
+<?php
+
+namespace Ivuorinen\BusinessDataFetcher\Dto;
+
+use Ivuorinen\BusinessDataFetcher\Traits\HasSource;
+use Spatie\DataTransferObject\DataTransferObject;
+
+/**
+ * Company Form
+ */
+class BisCompanyForm extends DataTransferObject
+{
+    use HasSource;
+
+    /**
+     * One for current version and >1 for historical company forms
+     *
+     * @var int
+     */
+    public int $version;
+    /**
+     * Date of registration
+     *
+     * @var string
+     */
+    public string $registrationDate;
+    /**
+     * Ending date of registration
+     *
+     * @var string|null
+     */
+    public ?string $endDate;
+    /**
+     * Name of company form
+     *
+     * @var string
+     */
+    public string $name;
+    /**
+     * Two letter language code
+     *
+     * @var string|null
+     */
+    public ?string $language;
+    /**
+     * Type of company form.
+     *
+     * Note: According to spec, this shouldn't be nullable,
+     * but payloads show otherwise.
+     *
+     * @var string|null
+     */
+    public ?string $type;
+}
diff --git a/src/Dto/BisCompanyLanguage.php b/src/Dto/BisCompanyLanguage.php
new file mode 100644
index 0000000..5142630
--- /dev/null
+++ b/src/Dto/BisCompanyLanguage.php
@@ -0,0 +1,45 @@
+<?php
+
+namespace Ivuorinen\BusinessDataFetcher\Dto;
+
+use Ivuorinen\BusinessDataFetcher\Traits\HasSource;
+use Spatie\DataTransferObject\DataTransferObject;
+
+/**
+ * Company Language
+ */
+class BisCompanyLanguage extends DataTransferObject
+{
+    use HasSource;
+
+    /**
+     * One for current version and >1 for historical company names
+     *
+     * @var int
+     */
+    public int $version;
+    /**
+     * Date of registration
+     *
+     * @var string
+     */
+    public string $registrationDate = '';
+    /**
+     * Ending date of registration
+     *
+     * @var string|null
+     */
+    public ?string $endDate = null;
+    /**
+     * Company name
+     *
+     * @var string
+     */
+    public string $name;
+    /**
+     * Two letter language code
+     *
+     * @var string|null
+     */
+    public ?string $language = null;
+}
diff --git a/src/Dto/BisCompanyLiquidation.php b/src/Dto/BisCompanyLiquidation.php
new file mode 100644
index 0000000..31d86a1
--- /dev/null
+++ b/src/Dto/BisCompanyLiquidation.php
@@ -0,0 +1,64 @@
+<?php
+
+namespace Ivuorinen\BusinessDataFetcher\Dto;
+
+use Ivuorinen\BusinessDataFetcher\Traits\HasSource;
+use Spatie\DataTransferObject\DataTransferObject;
+
+/**
+ * Company Liquidation
+ *
+ * - version (integer): One for current version and >1 for historical company forms
+ * - registrationDate (string): Date of registration
+ * - endDate (string, optional): Ending date of registration
+ * - name (string): Bankruptcy, liquidation or restructuring proceedings
+ * - language (string, optional): Two letter language code
+ * - type (string): Type of liquidation
+ */
+class BisCompanyLiquidation extends DataTransferObject
+{
+    use HasSource;
+
+    /**
+     * Order
+     *
+     * Zero for primary company name,
+     * other for translations of the primary company name
+     * and auxiliary company names
+     *
+     * @var int
+     */
+    public int $order;
+    /**
+     * One for current version and >1 for historical company names
+     *
+     * @var int
+     */
+    public int $version;
+    /**
+     * Date of registration
+     *
+     * @var string
+     */
+    public string $registrationDate = '';
+    /**
+     * Ending date of registration
+     *
+     * @var string|null
+     */
+    public ?string $endDate = null;
+    /**
+     * Bankruptcy, liquidation or restructuring proceedings
+     *
+     * @var string
+     */
+    public string $name;
+    /**
+     * Two letter language code
+     *
+     * @var string|null
+     */
+    public ?string $language = null;
+
+    public string $type;
+}
diff --git a/src/Dto/BisCompanyName.php b/src/Dto/BisCompanyName.php
new file mode 100644
index 0000000..0863b8d
--- /dev/null
+++ b/src/Dto/BisCompanyName.php
@@ -0,0 +1,55 @@
+<?php
+
+namespace Ivuorinen\BusinessDataFetcher\Dto;
+
+use Ivuorinen\BusinessDataFetcher\Traits\HasSource;
+use Spatie\DataTransferObject\DataTransferObject;
+
+/**
+ * Company Name
+ */
+class BisCompanyName extends DataTransferObject
+{
+    use HasSource;
+
+    /**
+     * Order
+     *
+     * Zero for primary company name,
+     * other for translations of the primary company name
+     * and auxiliary company names
+     *
+     * @var int
+     */
+    public int $order;
+    /**
+     * One for current version and >1 for historical company names
+     *
+     * @var int
+     */
+    public int $version;
+    /**
+     * Date of registration
+     *
+     * @var string
+     */
+    public string $registrationDate = '';
+    /**
+     * Ending date of registration
+     *
+     * @var string|null
+     */
+    public ?string $endDate = null;
+    /**
+     * Company name
+     *
+     * @var string
+     */
+    public string $name;
+    /**
+     * Two letter language code
+     *
+     * @var string|null
+     */
+    public ?string $language = null;
+}
diff --git a/src/Dto/BisCompanyRegisteredEntry.php b/src/Dto/BisCompanyRegisteredEntry.php
new file mode 100644
index 0000000..858b528
--- /dev/null
+++ b/src/Dto/BisCompanyRegisteredEntry.php
@@ -0,0 +1,108 @@
+<?php
+
+namespace Ivuorinen\BusinessDataFetcher\Dto;
+
+use Ivuorinen\BusinessDataFetcher\Exceptions\UnexpectedValueException;
+use Spatie\DataTransferObject\DataTransferObject;
+
+/**
+ * Company Registered Entry
+ */
+class BisCompanyRegisteredEntry extends DataTransferObject
+{
+    /**
+     * Description of entry
+     *
+     * @var string
+     */
+    public string $description;
+    /**
+     * Zero for common entries, one for ‘Unregistered’ and two for ‘Registered’
+     *
+     * @see getStatusText()
+     *
+     * @var int
+     */
+    public int $status;
+    /**
+     * Date of registration
+     *
+     * @var string
+     */
+    public string $registrationDate;
+    /**
+     * Ending date of registration
+     *
+     * @var string|null
+     */
+    public ?string $endDate;
+    /**
+     * register (integer):
+     * - One for Trade Register,
+     * - two for Register of Foundations,
+     * - three for Register of Associations,
+     * - four for Tax Administration,
+     * - five for Prepayment Register,
+     * - six for VAT Register,
+     * - seven for Employer Register and
+     * - eight for register of bodies liable for tax on insurance premiums
+     *
+     * @see getRegisterText()
+     *
+     * @var int
+     */
+    public int $register;
+    /**
+     * Two letter language code
+     *
+     * @var string|null
+     */
+    public ?string $language;
+    /**
+     * authority (integer):
+     * - One for Tax Administration,
+     * - two for Finnish Patent and Registration Office and
+     * - three for Population Register
+     *
+     * @see getAuthorityText()
+     *
+     * @var int
+     */
+    public int $authority;
+
+    public function getStatusText(): string
+    {
+        //  Zero for common entries, one for ‘Unregistered’ and two for ‘Registered’
+        return match ($this->status) {
+            0 => 'Common',
+            1 => 'Unregistered',
+            2 => 'Registered',
+            default => throw new UnexpectedValueException('Unexpected value: ' . $this->status)
+        };
+    }
+
+    public function getRegisterText(): string
+    {
+        return match ($this->register) {
+            1 => 'Trade Register',
+            2 => 'Register of Foundations',
+            3 => 'Register of Associations',
+            4 => 'Tax Administration',
+            5 => 'Prepayment Register',
+            6 => 'VAT Register',
+            7 => 'Employer Register',
+            8 => 'register of bodies liable for tax on insurance premiums',
+            default => throw new UnexpectedValueException('Unexpected value: ' . $this->register),
+        };
+    }
+
+    public function getAuthorityText(): string
+    {
+        return match ($this->authority) {
+            1 => 'Tax Administration',
+            2 => 'Finnish Patent and Registration Office',
+            3 => 'Population Register',
+            default => throw new UnexpectedValueException('Unexpected value: ' . $this->authority),
+        };
+    }
+}
diff --git a/src/Dto/BisCompanyRegisteredOffice.php b/src/Dto/BisCompanyRegisteredOffice.php
new file mode 100644
index 0000000..1ae2845
--- /dev/null
+++ b/src/Dto/BisCompanyRegisteredOffice.php
@@ -0,0 +1,51 @@
+<?php
+
+namespace Ivuorinen\BusinessDataFetcher\Dto;
+
+use Ivuorinen\BusinessDataFetcher\Traits\HasSource;
+use Spatie\DataTransferObject\DataTransferObject;
+
+/**
+ * Company Registered Office
+ */
+class BisCompanyRegisteredOffice extends DataTransferObject
+{
+    use HasSource;
+
+    /**
+     * Zero for primary place of registered office, positive for others
+     *
+     * @var int
+     */
+    public int $order;
+    /**
+     * One for current version and >1 for historical places of registered office
+     *
+     * @var int
+     */
+    public int $version;
+    /**
+     * Date of registration
+     *
+     * @var string
+     */
+    public string $registrationDate;
+    /**
+     * Ending date of registration
+     *
+     * @var string|null
+     */
+    public ?string $endDate;
+    /**
+     * Name of place of registered office
+     *
+     * @var string
+     */
+    public string $name;
+    /**
+     * Two letter language code
+     *
+     * @var string|null
+     */
+    public ?string $language;
+}
diff --git a/src/Exceptions/ApiResponseErrorException.php b/src/Exceptions/ApiResponseErrorException.php
new file mode 100644
index 0000000..7799919
--- /dev/null
+++ b/src/Exceptions/ApiResponseErrorException.php
@@ -0,0 +1,5 @@
+<?php
+
+namespace Ivuorinen\BusinessDataFetcher\Exceptions;
+
+class ApiResponseErrorException extends \Exception {}
diff --git a/src/Exceptions/UnexpectedValueException.php b/src/Exceptions/UnexpectedValueException.php
new file mode 100644
index 0000000..ea94f4e
--- /dev/null
+++ b/src/Exceptions/UnexpectedValueException.php
@@ -0,0 +1,5 @@
+<?php
+
+namespace Ivuorinen\BusinessDataFetcher\Exceptions;
+
+class UnexpectedValueException extends \Exception {}
diff --git a/src/Traits/HasSource.php b/src/Traits/HasSource.php
new file mode 100644
index 0000000..4315a3d
--- /dev/null
+++ b/src/Traits/HasSource.php
@@ -0,0 +1,34 @@
+<?php
+
+namespace Ivuorinen\BusinessDataFetcher\Traits;
+
+trait HasSource
+{
+    /**
+     * Source of the information.
+     *
+     * source (integer, optional):
+     * - Zero for common,
+     * - one for Finnish Patent and Registration Office,
+     * - two for Tax Administration or
+     * - three for Business Information System
+     *
+     * Use `getSourceText()` to get the text representation.
+     *
+     * @see getSourceText()
+     *
+     * @var int|null
+     */
+    public ?int $source;
+
+    public function getSourceText(): string
+    {
+        return match ($this->source) {
+            0 => 'common',
+            1 => 'Finnish Patent and Registration Office',
+            2 => 'Tax Administration',
+            3 => 'Business Information System',
+            default => '',
+        };
+    }
+}