I have a textbox on my page where a user can enter URLs that they would like QR codes for.The format is one URL per line. The HTML separates the URLs nicely for me with a \r\ after each one. The problem is getting these in the return_url that PayPal calls to get back to may site after approving the transaction. I build a return URL for PayPal to use that has the contents of the textara as one parameter called "instructions" and I can see the %0D%0A in the characters so I know I'm sending these to PayPal. But when PayPal calls me back with the return_url the \r\n characters are gone and I'm not able to separate out the URLs in the instructions parameter., other than looking for 'www' etc.
A normal software solution would be to save the URLs away before the transfer to another piece of software and get them back from there when you're called back, but with web programing, there's no place to store them away, other than a database or a file. Cookies aren't going to work when it's PayPal your communicating with.
Just wondering if someone else has run into this and has some thoughts on it.