Custom Payment Gateway

Dear Support,
Kindly let me know if I want a custom payment gateway solution is that possible or not? My client’s website is based in Pakistan and he wants to integrate the following plugins to accept online payment.

https://easypaisa.com.pk/business-solutions/online-payment-gateway/
https://www.jazzcash.com.pk/jazzcash-for-business/online-payment-gateway/

Or is there any other payment gateway that can be accessible in Pakistan?

Looking forward to your kind response.

Sincerely,
Ammad Jaffer.