Unable to find products with ID via Headless API

Issue

• Noticed that products have two ID fields, when you fetch them via headless API
  
  • id
  • productId
• id is visible on the UI and productId is not.
• When you try to get products via headless API using id, it does not work:
  E.g.: GET /o/headless-commerce-admin-catalog/v1.0/products/{id}

Environment

• Commerce 4.0 (DXP 7.4) reposted so far

Resolution

• When headless APIs are used, the productId is the only ID that the endpoint is using and looking for.

Additional Information

• It is done by design. There is a related ticket already, to make the productId more clear on the UI as well: https://issues.liferay.com/browse/COMMERCE-8913