error 64

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:

The format of the field is incorrect.

The vads_sub_desc field is a mandatory parameter used in the case of creating a recurring payment. It designates the recurring payment rule to be applied.

The expected value for this parameter is a chain of characters that comply with the iCalendar (Internet Calendar) specification, described in RFC5545 (see


To program installment payments taking place on the last day of each month for 12 months, the rule is:


This rule means that if the current month does not have 31 days, the machine will take the 30th into account. If the 30th does not exist, the machine will take the 29th into account, and so on until the 28th.

Make sure that the values entered in the form respect the expected format.