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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:

Your MID has not been enrolled.

You have forced the payment method to be used (vads_payment_cards) in your payment form.

However, the transmitted payment method needs enrollment.


  • From your Merchant Back Office, open the menu Settings > Company. Click Merchant IDs and select your MID. Click on the enrollment tab then on the Enrol Merchant ID (MID) button.
  • Contact E-commerce customer service.