If you are a reseller under MSG91, it is compulsory for you to make the payment through the MSG91 website. You cannot make the payment via your own website.
The payment gateways for MSG91 are integrated on our website only and therefore you need to make payment through our website itself. You can log in to your account on our website by following the link- https://control.msg91.com/signin/ and make your payment by our panel.