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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_sub_init_amount_number field is an optional parameter used in the case of creating a recurring payment. It represents the number of installments for which the vads_sub_init_amount should be applied. It must consist of numeric characters with a variable length up to 3 characters (n..3).

Check that the value entered in the form is correct.