Interswitch API

Where can i get Interswitch API?

i have one

this is an article explaining webpay integration http://www.stackarena.com/2012/05/integrating-your-website-with-interswitch-crash-course-part-1/

Hello, everybody. I thought all answers in relating to this question is supposed to be strictly to asp.net(hope i am right, coz i am new), cos i followed the link gives by tbenjis, but it tutned out to be php. I am also in need of interswitch api integrated in my asp.net web application, any. way what i did was to convert the guys php code to asp. I hope it works. Though i wouldnt mind if i can anyone done in C#.