Hi Pierre Alain,
I apologize for the delay in response.
To show the GatewayAuthCode on the invoice, go to Backend->Design->Widget Templates then look for Order Invoice template and paste the below snippet after Payment method.
Gateway Auth Code:<%# string.Join("<
>)Eval("Payments")).Where(op => op.SuccessfulPayment).Select(op => op.GatewayAuthCode)) %>
For showing more detail on a failed payment, please set GatewayResponse
field. This text gets shown to the user in case of failed transaction.
the Telerik team
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