Confirming a processed payment with PayPal in PHP

I am integrating PayPal into my website and need to know how I can confirm that a payment has been processed or not. 开发者_如何学运维

I need PayPal to send me a response via PHP get that confirms the payment. Is there an option?

Thanks.

See the "Completing the Express Checkout Transaction" section of this page. After you send the request, PayPal will send an NVP response including the transaction ID.

https://cms.paypal.com/us/cgi-bin/?cmd=_render-content&content_ID=developer/e_howto_api_ECSimpleIntegration

If you aren't using the Express Checkout API, and instead using Website Payments Pro, there is documentation at the link on the left-hand side that details that.

If you have a more specific question, feel free to comment. :)