DrByte:
How "exact"? Same hosting? Same version? Same addons?
Are funds showing up in PayPal? or just not on your admin page?
Define "before" ...
Which SEO mod? What happens if you turn it off?
OK maybe not "exact". Here's my case:
Customer adds item to cart
Clicks on Express Checkout for PayPal
Taken to PayPal login page. Login successfully.
Taken to Order Summary. Click Continue.
Taken back to ZC Step 2. Click Continue.
Taken to ZC Step 3. Click Confirm.
Taken to Order Checkout Success.
This was tested on Production (not Sandbox). Order shows up on ZC Admin, but all the payment info in the gray table is blank. Customer receives email confirming order from ZC. Funds do NOT show up on either buyer or seller's PayPal account (not even a transaction is recorded).. therefore no email from PayPal is ever sent out either.
It's as if there was a step missing/failed, but I'm not sure where/how to find the root cause.
Curl works fine, Non-SSL.
Hosting is on HostMonster.
ZC ver 1.3.7.1
"Before" was approx 1 month ago. I do not believe anything changed since then, and if so, it was the Simple SEO URL mod. Thus, for now, it's safe to assume all mods installed are not the cause. I already checked the URLs being sent to/from PayPal and they seem ok:
ReturnURL: /ipn_main_handler.php?type=ec
CancelURL: /login/ec_cancel/1
And user was taken to the checkout_success URL just fine, so I don't suspect the SEO mod to have affected this error.