You will find all our samples on Batch's GitHub account. Here is a list of the sample projects you can use:
iOS
This sample is a full-fledged example meant to show both basic and advanced integration of the Batch SDK with a real-world use case.
Android
The Batch Store sample integrates all Batch features: Custom data, In-App messages, Inbox, and more.
Ionic
We also have an Ionic sample you can use: