In PRODUCTION mode, if your buyer gets an error message such as:
|An error occurred during the payment request, please make sure that the posted parameters match the ones specified in the documentation.|
It becomes impossible to make the payment and the transaction is definitively lost.
You will receive an email notification containing the form that the gateway was unable to process and the value of the invalid field.
We invite you to check the following reason(s) to resolve the issue:
|Your payment gateway is not authorized to make payments with your PayPal account anymore.|
In order to accept PayPal payments, you must authorize the payment gateway to make payments for you.
To resolve the issue:
For more information, see the documentation for PayPal payment integration.