Return any available coupons valid for a specified one-time product or subscription plan.
The vendor ID identifies your seller account. This can be found in Developer Tools > Authentication.
The vendor auth code is a private API key for authenticating API requests. This key should never be used in client side code or shared publicly. This can be found in Developer Tools > Authentication.
The specific product/subscription ID.
An unsuccessful call to the Dashboard API will return a 200 response containing a field
success set to
false and an error object.