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copied!<p>In any system like this, you need robust error handling and error reporting. This is doubly true when it comes to dealing with payments, where you absolutely do not want to accidentaly take someone's money and not deliver the goods.</p> <p>Because you're outsourcing your payment handling to a 3rd party, you're ultimately very reliant on the gateway having robust error handling and reporting systems.</p> <p>In general then, you hand off control to the payment gateway and start a task that waits for a response from the gateway, which is either 'payment accepted' or 'payment declined'. When you get that response you move onto the next step in your process and everything is good.</p> <p>When you don't get a response at all (time out), or the response is invalid, then how you proceed very much depends on the payment gateway:</p> <ul> <li><p>If the gateway supports it send a 'cancel payment' style request. If the payment cancels successfully then you probably want to send the user to a 'sorry, please try again' style page.</p></li> <li><p>If the gateway doesn't support canceling, or you have no communications to the gateway then you will need to manually (in person, such as telephone) contact the 3rd party to discover what went wrong and how to proceed. To aid this you need to dump as much detail as you have to error logs, such as date/time, customer id, transaction value, product ids etc.</p></li> </ul> <p>Once you're back on your site (and payment is accepted) then you're much more in control of errors, but in brief if you cant complete the order, then you should either dump the details to disk (such as csv file for manual handling) or contact the gateway to cancel the payment.</p> <p>Its also worth having a system in place to track errors as they occur, and if an excessive number occur then consider what should happen. If its a high traffic site for example you may want to temporarily prevent further customers from placing orders whilst the issue is investigated.</p>

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