The Payfirma Push Android SDK by Payfirma allows to integrate payments through API interaction. An example use case shows ACME as the invoicing application that intends to include credit card payments using the interface. Input and output variables display code associated to merchant's payment. For facilitation purposes, sample code presents a business transaction with a determined filter.
How can developers make money? That’s a big question in the mobile app space, and the answer is changing. There has been a gradual recognition over the past few years that one-time payment for apps (those “paid apps” that we avoid downloading if we can) is not the happy-face solution for most developers aiming to be compensated adequately for the creative work they do.
Locu, one of CNN's hot startups to watch, has released an API that exposes Locu's database of business information to third party developers. Locu launched the Locu API at Tech Disrupt SF 2012 and drew immediate attention. The API allows developers to retrieve real-time business data (e.g. venue information, pricelists, menus, etc.) and integrate the data into existing applications. Locu's index crawls the web for business data, and the API makes that data available to other websites and applications.