USE Case

- Use Case 1 : To build a LWC component on Case recordPage to
  show Support Agent with Customer Product Subscriprtion and Pricing.
- Use Case 2 : To Build Apex REST service for Exteranl System 
  to acces Product Subscription and Pricing with UUID.

What to Do?

- DataModel : Custom metadata for mainting configuration of 
  Countries and Products Pricing.
- Use Case 1 :
    - Lightning Web Component to Display Subcription and Pricing Data.
    - Build a controller server side(Apex Class) for LWC.
- Use Case 2 :
    - Build a REST Service Apex Class for External System.
    - Connected App Configuration
.
    - Cover the the Apex classes by Validating the scenarios in Test classes

Assumption

- IDP  is already taking care of UUID generatiom which need to be populated 
  on Salesforce Contact / Customer User Provisioning.

How to do?

- Clean Code Practices
- Test Driven Development
- OOPS
- Salesforce Best Practices

Final Output

1 :

2 :