For integrating the B2C Commerce platform with the client's OMS using REST services, the required configurations include:

Service Configuration: This specifies the service endpoints, HTTP methods, and any other service-specific settings necessary for the integration.

Service Profile Configuration: This defines the behavior of the service such as timeout settings, retry logic, and cache settings.

Service Credential Configuration: This involves setting up the credentials that will be used to authenticate the requests to the client’s OMS. These credentials are often managed securely through encrypted storage and retrieval mechanisms.

These configurations ensure secure, efficient, and reliable communication between the B2C Commerce platform and the client’s OMS, adhering to best practices in web service integration.