Venmo App Switch iOS SDK Library
This open-source Cocoa Touch Static Library allows users of your app to pay or charge with Venmo. It switches to the Venmo app if it's installed on the device. Otherwise, it opens Venmo in a web view. When the transaction is complete, it switches back to your app.
If you just want to integrate the SDK, follow the directions here.
Venmo SDK Apps
Fork this repo on GitHub, add your fork as a remote, add your changes and push.
git remote add myusername email@example.com:myuser/app-switch-ios.git git push myusername master
Send Venmo a pull request on GitHub.