# Showing the Drop-in UI

## Overview

Once you have initialised the Ryft Drop-In SDK, as indicated in the [initial setup](/documentation/get_started/process_payments/android/initial_setup), you can show the Drop-In payment UI to your users.

## Displaying the Drop-In UI

In order to display the Drop-In UI, you can call the `show()` method on the `RyftDropIn` instance you created during the initialisation step. This will include passing the necessary configuration parameters required for the payment process, such as:

- Your **Public Key**;
- The **Client Secret** obtained from your backend when creating a Payment Session;
- (Optional) The **Account ID** if you are processing payments on behalf of a Sub-Account.


Here's an example of how to show the Drop-In UI in your activity or fragment:

Single Payment

```kotlin Showing the Ryft Android Drop-In UI - Single Payment
class CheckoutActivity : ComponentActivity() {

    // ...
    private lateinit var payButton: Button  // Example pay button
    // ...
    
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        // ...
        payButton.setOnClickListener {
            showDropIn()
        }
        // ...
    }
    
    // ...
    
    private fun showDropIn() {
        ryftDropIn.show(
            RyftDropInConfiguration.standardAccountPayment(
                clientSecret = "",  // The client secret returned when creating a Payment Session
                publicApiKey = RyftPublicApiKey("")  // Your Ryft Public API Key
            ),
        )
    }

    // ...
}
```

Platform Fee Payment

```kotlin Showing the Ryft Android Drop-In UI - Platform Fee Payment
class CheckoutActivity : ComponentActivity() {

    // ...
    // Example pay button
    private lateinit var payButton: Button
    // ...
    
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        // ...
        payButton.setOnClickListener {
            showDropIn()
        }
        // ...
    }
    
    // ...
    
    private fun showDropIn() {
        ryftDropIn.show(
            RyftDropInConfiguration.subAccountPayment(
                clientSecret = "",  // The client secret returned when creating a Payment Session
                publicApiKey = RyftPublicApiKey(""),  // Your Ryft Public API Key
                subAccountId = ""  // The Id of the Sub-Account you are taking payments for
            ),
        )
    }
    
    // ...
}
```

The Drop-In will automatically detect the appropriate environment (test or live) based on the provided Public Key.

## Add Google Pay

To enable **Google Pay** in the Drop-In UI, you need to ensure that:

- You have provided a **RyftDropInGooglePayConfiguration** object when displaying the Drop-In UI.
- The user has a valid Google Pay method set up on their device.


Google Pay will be disabled in the Drop-In UI if the above conditions are not met.

Here's an example of how to enable Google Pay in the Drop-In UI:

Single Payment

```kotlin Enabling Google Pay in Ryft Android Drop-In UI - Single Payment
private fun showDropIn() {
    ryftDropIn.show(
        RyftDropInConfiguration.standardAccountPayment(
            // ...
            googlePayConfiguration = RyftDropInGooglePayConfiguration(
                merchantName = "",  // The name of your business as it should appear in Google Pay
                merchantCountryCode = ""  // The ISO 3166-1 alpha-2 country code of your business (e.g., "UK")
            )
        ),
    )
}
```

Platform Fee Payment

```kotlin Enabling Google Pay in Ryft Android Drop-In UI - Platform Fee Payment
private fun showDropIn() {
    ryftDropIn.show(
        RyftDropInConfiguration.subAccountPayment(
            // ...
            googlePayConfiguration = RyftDropInGooglePayConfiguration(
                merchantName = "",  // The name of your business as it should appear in Google Pay
                merchantCountryCode = ""  // The ISO 3166-1 alpha-2 country code of your business (e.g., "UK")
            )
        ),
    )
}
```

With this setup, Google Pay will be available as a payment option in the Drop-In UI, provided the user has it configured on their device.

## Next Steps

After displaying the Drop-In UI, you will need to handle the payment result. This is done by implementing the `RyftDropInResultListener` interface in your activity or fragment.

For more information on how to implement the listener and handle payment results, please refer to the [Drop-In Listener](/documentation/get_started/process_payments/android/drop_in_listener) section.