This used to work perfectly two days ago. But now, I've been testing it with the sandbox and every time I get the following: "Failed or missing response from payment verification. Manual verification is required! this link" in the admin panel and the user gets "Oops! We have experienced some issue with your transaction. Your order will be verified manually by administrator.". I've tried reinstalling AbanteCart and using the extension in a fresh manner, nothing else but the demo data, and I still got the same error even after making sure that the transaction was successful in the PayPal merchant account. I am at a loss. Has anyone had any similar issue?
Thank you,
Henry.
PS: I'm using the latest AbanteCart v1.2.12