I'm working with a web application that allows our customers to integrate with Apple Pay on the web. The customers setup their own Apple Pay merchant accounts, a third party handles the actual payment processing, but our servers are responsible for web hosting and obtaining the payment sessions.
Sporadically for some customers, we receive a 400 error when obtaining the payment session, with a message of:
Payment Services Exception merchantId={id} unauthorized to process transactions on behalf of merchantId={id} reason="{id} never authorized mass enablement transactions to occur via {id}"
(Here all the {id} values will be the same).
Despite sounding like a configuration issue with the account, this will only affect some otherwise identical requests. (Same domain, merchant identity, etc.) It affects some customers but not most; when it does affect a customer, somewhere between 10% to 50% of the session requests will fail in this manner. We have several customers never hitting this error even after processing thousands of transactions.
The phrase "mass enablement" doesn't seem to show up in apple's documentation, and the exact phrase "never authorized mass enablement transactions to occur" produces no results at all when searching the web. The closest I can find is this thread on Apple's developer forums but its not an exact match, and has no answers in any case.
Has anyone seen this error and resolved it?
(I'm also pursuing this matter via Apple support; if that eventually proves fruitful I'll update with an answer.)
