There are tons of sdks and libraries that you can use with C# / .net. To name just a small few that I have used: Stripe's .net sdk, parse.com's sdk, amazon's

There are tons of sdks and libraries that you can use with C# / .net. To name just a small few that I have used: Stripe's .net sdk, parse.com's sdk, amazon's sdk for .net... the list goes on and on. Pull their dlls in and just use them. It makes a cinch of hooking into other services.