How to Delete a Contact <-> Product relationship?

How to Delete a Contact <-> Product relationship?

How can I, with the API, remove a relationship between a Contact and a Product?  This is needed for example, when a customer has returned a product and we want to update Zoho to reflect that.

Basically what I am looking for is the exact opposite of https://help.zoho.com/portal/en/community/topic/adding-a-product-to-a-contact-via-api

Thank you!