Product information from API request

Product information from API request

Hello,
From our API request we can get the following data:
- To which account a contact is related.

But we can not see:
- To which products a contact is related.
- To which accounts a product is related

Is there a way to get this info from the API request?
We need this in order to combine correct products to the correct customer in our own database.

Kind regards,
Bo Thygesen