The service product for which the payment is submitted. Only products classified as Termed services are allowed to be specified and only as long as they exist ona subscirpiton that follows a prepaid billing term schemeon one of the account owner's subscriptions. The allowed product identifier fields are the following:
Include Page
product_identifier
product_identifier
Tip
From CRM.COM R14.0.0 onward, any product can be specified as one of the payment's products regardless of its classification