The Venmo API is made up of two different public APIs. "The Payment Links API provides a simple method for sending invoices or suggested payments via any medium (Email, SMS, Facebook, Twitter). Payment links have 3 optional parameters and are constructed by adding these parameters to the base URL. The Receipts API allows every Venmo user to send receipt data for payments they receive to a third party webservice. By default, users get receipts via Email and SMS, but the Receipts API provides a simple method for automating followup actions to payments (like collecting a postal address for fulfillment or automating digital fulfillment via email)."
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The Venmo Android SDK by Venmo implements billing and payments into mobile applications. It includes usage with the necessary steps to create an account, download files, and open a new screen to initiate payment activity.
Venmo allows to make and share payments at no cost. The developer site presents a number of resources that could facilitate application creation. That page includes iOS and Android SDKs. The iOS can be found on Github. Along with repository, a visual supplementary guide includes installation, initialization, and contribution sections. Like the iOS, Android's repository can be also found on Github, together with 4 steps to integrate Venmo into an Android app.