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POPHP Validation - passing http POST values forwards to a 3rd party checkout
 

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    <p>I don't know whether this is possible, I can't seem to find any other help guides so this may not be possible...</p> <p>I have a checkout page which POSTs a load of variables forwards to a 3rd party payment processor (WorldPay).</p> <p>I want to know if it is possible to put a PHP script of some sort inbetween the two pages for validation purposes.</p> <p>EG if an item in the basket has sold out while they were filling out the form, it could catch the customer before money is taken. Or useful if they tamper with form data.</p> <p>If I do this on my own site I could use sessions to pass the POST data forward but as it's an external website, I don't know how to send the data without making another HTML page with a hidden form &amp; refresh for instance.</p> <p>Is it possible to do this 'invisibly' - not actually showing a HTML page inbetween?</p>
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    1. COIt looks to me like you're trying to solve the wrong problem here. How about implementing a reservation for the items in the basket, for a preset time allowing the checkout to be completed? The method described by @digitalson would give me the creeps, and I would be hauling ass off your site, if it were to ask me for passwords for a 3rd party site. (Which I assume Worldpay has.) If reserving items is not an option, I would suggest the Ajax way, and taking the risk for non-JS users, which will simply have to have their money returned, if items are sold out during checkout.
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    2. CO@nickc: I was working under the assumption this was a **virtual terminal** not a system like Google Wallet or the simple implementation of PayPal where the user must sign in to the other site. Probably assumed this because thats what im used to working with.
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    3. CO@nikc The Ajax way allows reservation right during the callback or other nifty stuff you could do in the php code. It is pretty flexible. One could do UPDATE...SET reserved_count=reserved_count+x during the callback and just reverse the process if the checkout fails (keeping track of JS users of course!) - this idea should be transaction-safe (using SELECT ... FOR UPDATE)
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