# Security Mechanisms

## Restrictions

Paycontacless SDK does not allow run the app on the following situations and enviroments.

* Debug Build of app
* Rooted Device
* Emulators
* Custom Rooms
* Virtual Environment
* Installing app from unknown resource. Only Google Play Store is allowed.

## Device Unique Id <a href="#id-10.1.-device-unique-id" id="id-10.1.-device-unique-id"></a>

The SDK has several mechanisms in order to recognize and uniquely identify the end user device. The API calls from the Integrating app to the Backend system also requires some additional controls to be executed on the Backend server checks like device status, device safety, etc. In order to achieve this, the SDK returns a deviceId to the Integrating application.

## Recommendations for Integrating Application <a href="#id-10.2-recommendations-for-integrating-application" id="id-10.2-recommendations-for-integrating-application"></a>

* The integrating application is advised to block screen captures for other functionality and should not provide alternative tap on phone solutions.
* The integrating application is advised to block split screen usage entirely or for the transaction screens.


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