error 138

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 vads_url_post_wallet field is not populated correctly.

The vads_url_post_wallet field allows merchants to provide a URL on which they will be recalled during exchanges when using wallets.

The gateway uses it, for example, to provide you with useful information about the buyer during a two-step transaction using a wallet.

Example: vads_url_post_wallet =

Make sure the field respects the format of a URL.
  • Verify the used protocol (http:// or https:// ).
  • Make sure the domain name is renamed with a correct extension (e.g.: .com / .net / etc.)