Checkout
    
    complete
complete Callback
The complete callback will be invoked when the payment has been completed.
Usage
The complete callback must be defined using the data-complete
        attribute on the Checkout
        script tag. The attribute value may be the name of a global function or a URL string. URLs will have a
        query parameter appended for each argument.
The complete callback is only supported in a Return To Merchant integration.
Example
<html>
    <head>
                <script src="https://mtf.gateway.mastercard.com/checkout/version/24/checkout.js"
                data-complete="completeCallback">
        </script>
        <script type="text/javascript">
            function completeCallback(resultIndicator, sessionVersion) {
            //handle payment completion
            }
        </script>
    </head>
    ...
</html>
    <html>
    <head>
                <script src="https://mtf.gateway.mastercard.com/checkout/version/24/checkout.js"
                data-complete="http://[your domain]/receiptPage"></script>
    </head>
    ...
</html>
Arguments
        resultIndicator
        
        String
        
    The result indicator can be used to securely determine if the payment succeeded in a Return To Merchant integration.
        sessionVersion
        
        String
        
    Version of the Payment Session after payment completed.
Return Value
None