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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 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:

The format of the field is incorrect.

The vads_threeds_cavvAlgorithm field informs about the algorithm used by the ACS to generate the CAVV value. It must consist of numeric characters with a fixed length of 1 character (n1).

The possible values are:
Value Description
0 HMAC
1 CVV
2 CVV_ATN
3 MasterCard SPA

Check that the value entered in the form is correct.