Sometimes, issues with credit cards and gift cards can be difficult because there is so much involved: There’s POSitouch, there’s SlipStream/Txnplus, and there’s the credit card processor. The problem could be with any one of them.
Luckily, there’s a trick that almost always works to find the problem: Try running the transaction from the Batch Manager instead of from POSitouch.
If you don’t get the error from the batch manager, then it’s almost certainly a networking problem between POSitouch and SlipStream. Make sure your IP and port settings are correct in POSitouch and in SlipStream.
Using your psychic powers:
If you’re authorizing a credit card from the batch manager and you still get an error message, look at which letters are capitalized.
There are rare occasions when these rules don’t hold, but they’re almost always true. Often, if you know who actually wrote the error message, you can fix it pretty quickly.