When using the google.iap.billing plugin, after the purchase, the purchase is returned immediately and a message is sent to the mail:
Test purchase canceled due to lack of confirmation. You must confirm all purchases. If this is not done, the funds will be returned to customers. More details: https://developer.android.com/google/play/billing/integrate#process.
What am I doing wrong? Does everything work for everyone? There is nothing in the documentation about proof of purchase.