I am current testing integration in live environment using SIM approach, and upon my first transaction the payment form displays Unknown Error. Anyone know what causes this to appear?
I do not know how to upload images to this post, else I could provive a screenshot.
Solved! Go to Solution.
It worked. I can't believe that is what causing the problem. I say the documentation need a serious update as I can't find this 4111111111111111 anywhere. The redirect is successful so you have my thanks.
Now I have another issue though, the returned error message is "Unable to verify MD5 value.". I did not set any MD5 hash key in the merchant setting and I set the login key as the hash key in the relay url, which works in test site.