Retrieving Customer Account and Site Details via AR APIs (Addresses, Contacts, and Contact Points)

We are working on an integration with Oracle Cloud Fusion and need to retrieve customer-related information under the Accounts Receivable (AR) module.

Specifically, we want to fetch the following details for a given customer:

• Customer Account information
• Associated Account Sites and their Addresses
• Related Contacts and their Contact Points (such as phone numbers and email addresses, first name, last name)
  

Can you please guide us on the correct REST or SOAP APIs to use for retrieving this information? Any reference to API documentation, object relationships, or example requests would be greatly appreciated.

We have already tried using the Accounts REST API endpoint (/crmRestApi/resources/11.13.18.05/accounts) However, we are not seeing the expected customer account data.