Is there PayPal documentation of the (JSON) schemas for all the PayPal REST APIs? The API developer documentation is incomplete (and incorrect in many cases) regarding valid syntax for the JSON-formatted parameters to API calls. For example, I am trying to use "template_id" (per examples) when generating an invoice draft, but I always get a 400 BAD REQUEST error if I do. (When I leave it out of the JSON, I can generate a draft, but of course it's not using the invoice template that I want.) Aside from knowing valid syntax for individual parameters, it would be nice to know overall the valid syntax for the entire body of every call to every API.
