# Add Verification SDK into your application

You can quickly see how the Verification SDK works by trying the flashcall verification.

In this guide you will understand:
1. What are the prerequisites [to implement Android flashcall verification process.](#prerequisites)
2. How to [add Verification SDK into your app.](#add-verification-sdk-library)
3. Where to [search](#step-by-step-flashcall-sample) for a complete working sample showcasing flashcall verification flow.


## Prerequisites

Before you can get started, you need the following already set up:

* Sinch Build Dashboard [account](/docs/verification/getting-started/#1-sign-up).
* Android Studio and Android SDK tools available [here](https://developer.android.com/studio).
* Clone the [example code](https://github.com/sinch/FlashcallGettingStarted) from our github samples
* One physical Android device with SIM card installed.


## Step by Step flashcall sample

This guide uses [Flashcall Step by Step application](https://github.com/sinch/FlashcallGettingStarted) from our GitHub samples to showcase very basic and minimalistic use case of Sinch Verification SDK. The sample itself contains minimal amount of code needed to add and create a successful verification flow. In particular this sample doesn't use any architectural design patterns and keeps application credentials publicly visible in Java files for clarity of implementation.

You can use this sample as a base to understand how the flashcall verification works or integrate the SDK into your already existing Android app. Note that in that case all the code snippets have to be adjusted to work with your app specific codebase.

Although the sample and SDK itself is written in Kotlin you can use it in Java source files as well.

## Add Verification SDK library

Create a new Android Studio project using the `Empty activity` template. Open the `build.gradle` file in your `app` subfolder located in `<project_location>/app`, and populate that file with the code found on this page.

Note:
As this tutorial uses only flashcall verification to verify user's phone number we depend only on `com.sinch.android.sdk.verification:verification-flashcall:x.x.x` artficact. See [maven repository](https://search.maven.org/search?q=com.sinch.android.sdk.verification) to check for other verification method specific dependencies or use `verification-all` that combines all the available methods. Use the same link to verify what's the latest version of the verification Android SDK.

## Next steps

Now it's time to setup the application for the first verification request!

Set up the application
## Additional resources

Learn more about the Verification API:

*[API specification](/docs/verification/api-reference/verification)