: Determining if a visitor left your server We have an Apache server running a PHP website. The site is an e-commerce shop. We currently use Barclays as the payment provider but are seeing a

@Angie530

Since your form uses JS, you can run multiple functions from the onClick action. You could first call a script on your server that will run various tests against the remote payment gateway and then if the result is positive, pass back code to redirect the user to the gateway. If the test is failing, then you could send an error message.

This would provide some insight but to be 100% certain you would need to contact your processor for log details as recommended by @Andrew Lott.

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@Lee4591628

As a short-term check you could send a list of offending orders to Barclays and ask them to reply with a status for each one. They'll have a record of any transactions that made it to them, and should even be able to tell you how far into the process they made it before dropping off.

Obviously any orders that don't have a matching transaction in Barclays' system are the ones to focus on then. Perhaps you can look for a common pattern amongst those, like browser/OS version or ISP.

Depending on what integration method you're using, there's probably an API with the payment gateway which will let you query transactions on the fly. This is also really helpful to run regularly (as a nightly cronjob perhaps) to identify any orders which may have even been successful but the authorisation/response never made it back to your server after completion.

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