Text2Pay has rolled out a carrier billing service that lets Android developers enable in-app payments for more than 70 countries.

Following Apple’s lead, Google is letting developers test in-application billing, the first step in creating a sustainable business model for Android games and apps.

Bango forecasts that in-application charging in 2011 will grow more than 600 percent to account for close to 30 percent of all mobile application payments.

Mobile payments for digital goods is a growing trend, with gaming sites and social networks creating huge demand for user-friendly purchase mechanisms.

Boku has announced an in-app mobile billing service for the Android platform, letting users in 60 countries charge goods and services to their carrier bill.

PayPal has launched its Mobile Payments Library for the Android operating system, giving developers a way to integrate payments into the applications they build.

PayPal, a subsidiary of eBay, announced that its Mobile Payments Library is now in open beta and available to developers everywhere the Apple App Store is available.