---
title: Initialize
slug: r70--initialize
docTags: 
createdAt: 2025-06-03T09:23:48.027Z
---

## Installation

 Add the Pay3 SDK to your app's `build.gradle`

:::CodeblockTabs
build.gradle.kts

```none
dependencies {
    implementation("money.pay3:android-sdk:1.0.0")
}
```
:::

## Initialize the SDK

Initialize the Pay3 SDK in your application's main activity:

This function initialises Pay3 SDK to support Fiat Checkout flow.

*Pay3 team* shares values for `hostname` and `clientId`  during onboarding. Following parameters can be used for creating new instance of Pay3. 

**Parameters**

1. **hostname**: Pay3 will be opened in a new window using this hostname prefix. The host name is environment dependent. 
2. **clientId**: A unique client id is created for each client application. The client id is environment dependent.

:::CodeblockTabs
MainActivity.kt

```kotlin
import com.pay3.sdk.Pay3

class MainActivity : ComponentActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        
        // Initialize SDK with your client ID and hostname
        Pay3.init(this, "your-client-id", "https://pay3-hostname-shared-by-pay3") 
        
        // Rest of your activity code
    }
}
```
:::

***




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