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error 10203 - Error 10203 - FASTPRO_NOT_AVAILABLE_ON_PAYMENT_PAGE

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 e-mail 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:

Payment via FastPro is not available in this integration mode

Integration between FastPro and the payment gateway is only possible via REST web services.

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