# Sandbox App: Testing and Usage

Prerequisites to using the Sandbox app are:

* Partners must have the API credentials, and must have integrated with our API via the Pay Kit SDK

* Once they have integrated with Cash App Pay, they can use the Sandbox App to validate their integration

## Download and Install instructions

Contact the Partner Engineering team or your Cash App Point of Contact to set up the API credentials for your integration and to get the download and install instructions for the Sandbox App (both for Android and iOS).

The download links for the Sandbox App (for both Android and iOS) are as follows:

* **iOS link:** [https://testflight.apple.com/join/TZY8IaM9](https://testflight.apple.com/join/TZY8IaM9)

* **Android link:** [https://appdistribution.firebase.dev/i/fd95262a158a32fd](https://appdistribution.firebase.dev/i/fd95262a158a32fd)