Problem With Automated Donation System and Database

[AyJay]

So on my server, I am using a donation system which uses MySQL for players to donate and automatically get their perks without having to have my staff do it manually (quite the improvement from the enjin donation button). I have completely set it up but when I test it (I am testing it with sandbox paypal), I get this error: There was a problem with payment, your order is not in database.
Please contact admin to resolve this problem.

Is that an issue from using sandbox (will it be fixed when I try using regular Paypal) or is there something else I am missing? The database I am using for this specific need is open to external connections and I have made all proper configurations. Thanks in advance.

[kraze]

It's hard to say if it's an issue with sandbox Paypal, personally I've never heard of that, but to test this you could switch it over and make a small donation to yourself.

[Mr Sweg]

If you could provide me with the code, I could help you...
I'm planning on selling my fully automatic donation system soon :3
Supports demotions, different ranks that expire in x days or never expire.
Add an infinite amount of ranks, but enough of my system. We need the code to actually see what's causing that, is paypal saying that, or the script?