OK, this is hard to explain, so let me give an example first.
I use the CURL library to submit payment info to AUTHORIZE.NET. The page I hit is actually a dll page, and it returns transaction information to me (all this is done over secure https and this page never opens in a window, it is all done in the function). I parse their result to see if the payment was successful, get the transaction ID #, etc. Basically, they just return a big comma delimited list to me.
OK, now I'm in a position where I want to do something similar on my end. I want someone to be able to call a page on my site, and get a returned value back into their script. I don't necessarily need them to use CURL or use a secure method, because it isn't private data. I just want to return a string to someone. So, my question is, how can I set up a page on my site that will accept a call and some GET values, and return a string not to the screen necessarily, but back to the script that called it?
Any ideas?