Integration avangate.com payment processor

Hello,
2 years I use s2member plugin and is perfect for use Members Area.
I also use PayPal business but now I have problem.

PayPal don”t accepted clients from Egypt, Pakistan … and for these clients I use Avangate.com payment processor.

I would like add this payment processor to s2members.

Is this possible and how can I made this, because I don”t ger any details on internet.

Avangate.com support IPN:
https://secure.avangate.com/cpanel/help.php?topic=api#Instant%20Payment%20Notification

Thanks

https://wordpress.org/plugins/s2member/