I set up a wordpress site with Cart66 for a client and I cannot get it to function correctly. I've been struggling for weeks and the client is just about ready to kill me!
There are 2 ways to buy things from the site-- order and pay now with PayPal standard, or order and pay later (print receipt and mail with a check). When someone chooses the latter, the order appears just fine in the Cart66 dashboard and the customer and client both get a copy of the receipt.
When the customer pays with PayPal, they will receive a PayPal notification of the transaction, but they do not receive a receipt from Cart66 and the order does NOT appear in the Cart66 dashboard.
I have checked the IPN settings about a hundred times and have tested extensively with Sandbox, but PayPal is simply unable to communicate with Cart66 and I can't figure out why.
The site is hosted on Yahoo (which I later learned was a terrible choice for WordPress support) so I wonder if there is something Yahoo-related that is blocking the IPN from reaching Cart66. Has anyone heard of an issue with Yahoo preventing successful communication between PayPal and shopping carts? I've googled the sh*t out of the problem and have not found anything helpful.
The client would really like to offer digital products, but that's not possible as long as this problem persists.