Where do I find the documentation for
For an example, please take a look at the VTC API Reference page, link is provided below. I've included some screenshots for the information that you're looking for, as well.
Visa Transaction Controls > API Reference - https://developer.visa.com/capabilities/vctc/reference
Visa Transaction Controls > API Reference > Customer Rules API > Manage Controls by DocumentID - https://developer.visa.com/capabilities/vctc/reference#vctc__customer_rules__v1__manage_controls