I'm also having a problem with the same underlying error. The following is the error from a user in production. NSUnderlyingError = "Error Domain=ASDErrorDomain Code=907"
In case it helps here's the userInfo from the description. {NSUnderlyingError=0x2809e2c70 {Error Domain=AMSErrorDomain Code=6 \\"Payment Sheet Failed\\" UserInfo={NSLocalizedDescription=Payment Sheet Failed, NSLocalizedFailureReason=Payment sheet cancelled}}, NSLocalizedFailureReason=An unknown error occurred, NSLocalizedDescription=Unhandled exception}
Topic:
App & System Services
SubTopic:
StoreKit
Tags: