Add SMS Gateways

Dear Eng. Ahmed,
how can add SMS Gateways in Egypt
https://smsmisr.com/
and how will cost it to add in the plugin features

URL: https://www.smsmisr.com/api/send/?username=XXX&password=XXX&language=1&sender=XXX&mobile=2012XXXXXXX,2012XXX XXXX,&message=XXX&DelayUntil=08-09-2020-13-30

waiting your kind reply
Sameh

The page I need help with: [log in to see the link]