In the Non-Admin API, the "rpc/{accountId}/ApplyForRenewal" call, the API documentation shows that a "Coupon Code" can be submitted as part of the body of the request. The "rpc/{accountId}/applyForMembership" call does not show a "Coupon Code" in the documentation.

Is it supported? If yes, how should the request be formatted? If it is not supported, is there an alternate way to add a discount code to a membership invoice via API?

I have tried the following JSON body. It successfully creates a pending membership with the correct Level, but the discount code is ignored. (no error, it is just ignored). The code is valid and works if I apply for membership in the user interface.

{
"membershipLevelId": 1050822,
"Coupon Code":"CO100"
}