At Catappult, there are two different ways to integrate your billing: One-Step Payment (OSP) or Native Android SDK.

For the SDK billing solution, you can follow our guide to know how to implement it: Native Android SDK.

For OSP, depending on how you choose to integrate, the following guides are available with all the information you may need:

• One-Step Payment;
• Backend OSP Step-by-Step;
• No-Backend OSP Step-by-Step;
• Unity Backend OSP;
• Unity No-Backend OSP.

Minimum Requirements

• Minimum gradle plugin version is 3.0.1.
• Minimum build tools version is 26.0.1.
• The Android minimum API Level to use SDK is 16 (Android 4.1).