The Status Code indicates if the gateway was technically able to process the operation or not.

The Result Code is a three-digit number that specifies the result of the processed operation, e.g. "success" or "failure".

The Reason Code is a number containing more-detailed information on why the transaction was successful or failed, e. g. “Request successful” or “Authentication failed”.

Most gateway responses containing a special element:

A Customer Message that can be shown to the customer. This will help the customer correcting invalid data and result into a higher conversion rate. The language of this message depends on the customer-language (if submitted), the shop-language (if submitted) or the country code of the billing address.

Example

payment_request_response.xml
[…]
    <operation>PAYMENT_REQUEST</operation>
    <response-type>PAYMENT_PERMISSION</response-type>
[…]
    <processing>
        <timestamp>2018-09-13T10:55:04.000</timestamp>
        <status code="OK">Successfully</status>
        <reason code="700">Request successful</reason>
        <result code="402">Transaction result pending</result>
        <customer-message>The verification was successful. Thank you for choosing open invoice as your preferred method of payment.</customer-message>
    </processing>
[…]

In the example above you see the following codes:

<status code="OK">

<result code="402">

<reason code="700">

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