diff --git a/lib/api-code-examples.test.js b/lib/api-code-examples.test.js
index 6e4ddc4..74c08c0 100644
--- a/lib/api-code-examples.test.js
+++ b/lib/api-code-examples.test.js
@@ -3,6 +3,7 @@
 const dotenv = require('dotenv')
 const test = require('ava')
 const uuid = require('uuid')
+const queryString = require('query-string');
 const createSdkClient = require('./client')
 const pkg = require('../package.json')
 
@@ -38,6 +39,7 @@ const clientId = uuid()
 const exportId = uuid()
 const txId = uuid()
 const serial_number = clientId
+const last_revision = 1;
 
 test.before(async t => {
   await client({
@@ -174,6 +176,19 @@ test('list all exports', async t => {
   t.is(body._type, 'EXPORT_LIST')
 })
 
+test('list exports', async t => {
+  // const tssId = "...";
+  const response = await client({
+    url: `tss/${tssId}/export`,
+    method: 'GET',
+  })
+  const { body } = response
+
+  // The code example ends here.
+
+  t.is(body._type, 'EXPORT_LIST')
+})
+
 test('retrieve export', async t => {
   // const tssId = "...";
   // const exportId = "...";
@@ -288,27 +303,26 @@ test('retrieve transaction', async t => {
   t.is(body._id, txId)
 })
 
-// test('retrieve transaction log', async t => {
-//   // const tssId = "...";
-//   // const txId = "...";
-//   const response = await client({
-//     url: `tss/${tssId}/tx/${txId}/log`,
-//     method: 'GET',
-//   })
+test('retrieve transaction log', async t => {
+  // const tssId = "...";
+  // const txId = "...";
+  const response = await client({
+    url: `tss/${tssId}/tx/${txId}/log`,
+    method: 'GET',
+    json: false,
+    responseType: 'buffer'
+  })
 
-//   // The code example ends here.
+  // The code example ends here.
 
-//   t.truthy(response)
-// })
+  t.truthy(response)
+})
 
 
 test('upsert transaction', async t => {
   // const tssId = "...";
   // const txId = "...";
   // const clientId = "...";
-
-  // TODO: query string
-
   const response = await client({
     url: `tss/${tssId}/tx/${txId}`,
     method: 'PUT',
@@ -321,12 +335,13 @@ test('upsert transaction', async t => {
           other: {}
         }
       }
-    }
+    },
+    query: { last_revision }
   })
   const { body } = response
 
   // The code example ends here.
 
-  t.is(body._type, 'CLIENT')
-  t.is(body._id, clientId)
+  t.is(body._type, 'TRANSACTION')
+  t.is(body._id, txId)
 })
diff --git a/package.json b/package.json
index 20ea4d0..0d25972 100644
--- a/package.json
+++ b/package.json
@@ -15,15 +15,16 @@
     "ffi-napi": "^2.4.5",
     "got": "^9.6.0",
     "node-gyp": "^5.0.4",
-    "ref-napi": "^1.4.1",
-    "uuid": "3.3.3"
+    "ref-napi": "^1.4.1"
   },
   "devDependencies": {
     "@pgaubatz/uuid": "^0.1.0",
     "ava": "^2.2.0",
     "dotenv": "^8.0.0",
     "nyc": "^14.1.1",
-    "standard": "^13.0.0"
+    "query-string": "^6.8.3",
+    "standard": "^13.0.0",
+    "uuid": "^3.3.3"
   },
   "files": [
     "*.js"