[iPay88] What does the «Payment Not Allow» API response mean?
This is because your request page / checkout page URL is different with the URL you submit to ipay88 earlier. Please contact your account manager, or email@example.com to update your request URL.
Do take note that each merchant account only allow for one domain/ URL. Please request additional account from firstname.lastname@example.org if you have multiple domain to integrate with ipay88 payment gateway.