I use an online payment processor that can send ("push") status notifications to me by POSTing XML data to a URL aimed at a script/service on my server.
I'm not looking for an all-out lead-me-by-the-hand answer in this question, but if somebody could (a) give me a very brief idea of what is involved; and (b) point me at a good Delphi-relevant online resource that explains the nitty gritty mechanics, I'd appreciate it. Of course if somebody clarifies everything and steers me down a smooth road I'll probably up the points accordingly.
I use Delphi 7 (Enterprise Architect) and have no plans or desire to upgrade. On purely stubborn grounds, I refuse to use a Microsoft language to implement this solution!