Order: Gateway error notification. !!

[thunderings...@gmail.com]

Dear Thundering Surf Water Park Administrator, The following order FAILED processing due to a gateway error: Problem Order The user experiencing the problems is: <Melt...@msn.com> GATEWAY ERROR CODES: Fail Auth: 0 Msg: --- response_reason_text: A valid amount is required.transaction_id: "0"response_reason_code: "5"avs_result_code: Presponse_code: 3card_code: ""