PHP issue needs to be fixed

Avg Bid (USD)
Project Budget (USD)
$250 - $750

Project Description:
I have a

The coding for the PHP doesn't work correctly from the person that initially set it up for me. The customer pays for the transaction fine via PayPal, I receive their money but they don't get the files. The strange thing is that sometimes they get the files but most of the time they don't. Some of the feedback I have had is that they get a message saying "invalid ID" or something similar. I don't know if there is a browser issue, but the system really needs to work across all browsers.

I have 7 MP3 albums located
I need these 7 albums to be fully working, so when a customer makes a purchase they will receive the MP3 files.

I am hoping that the existing PHP system can be tweaked or modified, without needing to be rebuilt from scratch.

Please only contact me if you are confident you can fix this issue for a reasonable price.

Skills required:
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