Manual payment creation

Overview

With version 2 of our Web SDK, Universal Checkout automatically creates and handles Payments by default. This greatly reduces the complexity and amount of boilerplate required to integrate Primer. For backward compatibility reasons, it is still possible to manually create and resume payments. Follow this guide to setup Universal Checkout so that you handle the payment lifecycle.

Flow

Manual payment creation flow

Generate a clientToken on your backend by creating a Client Session with
POST/client-session
Initialize Universal Checkout with the clientToken to render the UI.
Universal Checkout will generate a paymentMethodToken when the customer submits their payment data, or when they select particular payment methods.
Create a payment using the paymentMethodToken via the Payments API
POST/payments
If the response indicates a requiredAction, you’ll get a new clientToken.
Pass the clientToken back to Universal Checkout to render next steps, like 3DS, and get a resumeToken.
Call
POST/payments/{id}/resume
with the resumeToken to resume the payment and wrap things up. (If a new requiredAction is returned, you’ll have to go back to step 5.)

Generate a Client Token

Get an API Key

Ensure you have an API key configured. Make sure to set the following scopes for your API Key:

client_tokens:write
transactions:authorize

Generate a Client Session

Follow the instructions here to create a client session, which will be used to initialize the checkout.

Set up Universal Checkout

Web
Android - Kotlin
Android - Java
iOS
React Native

Step 1. Turn off automatic payment creation

The Universal Checkout option paymentHandling defines how the SDK should handle payment creation and resume.Set paymentHandling to MANUAL to turn off automatic payment handling.This disables the callbacks onBeforePayment and onCheckoutComplete.

Typescript

Primer.showUniversalCheckout(clientToken, {
	/* Other options... */

	paymentHandling: 'MANUAL',
})

Step 2. Handle callbacks for creating and resuming payments

Two callbacks must be implemented:

onTokenizeSuccess() to create payments with paymentMethodToken
onResumeSuccess() to resume payments with resumeToken

Typescript

Primer.showUniversalCheckout(clientToken, {
	/* Other options... */

	paymentHanding: 'MANUAL',
	async onTokenizeSuccess(paymentMethodTokenData, handler) {
		// Send the Payment Method Token to your server
		// to create a payment using Payments API
		const response = await createPayment(paymentMethodTokenData.token)

		// Call `handler.handleFailure` to cancel the flow and display an error message
		if (!response) {
			return handler.handleFailure('The payment failed. Please try with another payment method.')
		}

		// If a new clientToken is available, call `handler.continueWithNewClientToken` to refresh the client session.
		// The checkout will automatically perform the action required by the Workflow.
		if (response.requiredAction.clientToken) {
			return handler.continueWithNewClientToken(response.requiredAction.clientToken)
		}

		// Display the success screen
		return handler.handleSuccess()
	},

	async onResumeSuccess(resumeTokenData, handler) {
		// Send the resume token to your server to resume the payment
		const response = await resumePayment(resumeTokenData.resumeToken)

		// Call `handler.handleFailure` to cancel the flow and display an error message
		if (!response) {
			return handler.handleFailure('The payment failed. Please try with another payment method.')
		}

		// If a new clientToken is available, call `handler.continueWithNewClientToken` to refresh the client session.
		// The checkout will automatically perform the action required by the Workflow
		if (response.requiredAction.clientToken) {
			return handler.continueWithNewClientToken(response.requiredAction.clientToken)
		}

		// Display the success screen
		return handler.handleSuccess()
	},
})

Handle `onTokenizeSuccess()` callback

When a customer submits their payment data, the payment details are tokenized and you’ll receive a paymentMethodToken in onTokenizeSuccess()
Create a payment request with the paymentMethodToken
If the payment is successful, call handler.handleSuccess() in order to display a success screen.
If the payment is unsuccessful, call handler.handleFailure(errorMessage) to display an error / failed message.
Payments API may return a new clientToken for additional steps (in the requiredActions on the response). In this case, call handler.continueWithNewClientToken(clientToken) to the checkout.

Handle `onResumeSuccess()` callback

Handling onResumeSuccess() is required to fully support 3DS and the majority of payment methods.

You will receive a resumeToken via the onResumeSuccess() callback if applicable
Send a resume payment request with the resumeToken
If the payment is successful, call handler.handleSuccess() in order to display a success screen.
If the payment is unsuccessful, call handler.handleFailure(errorMessage) to display an error / failed message.
Payments API may again return a new clientToken for additional steps. In this case, call handler.continueWithNewClientToken(clientToken) again.

Step 1. Install

Add the following to your app/build.gradle file

KOTLIN

repositories {
  mavenCentral()
}

dependencies {
  implementation 'io.primer:android:latest.version'
}

For more details about SDK versions, please see our changelog.It is highly recommended to add following settings to your app/build.gradle file:

KOTLIN

android {
    kotlinOptions {
        freeCompilerArgs += '-Xjvm-default=all'
    }
}

Step 2. Initialize the SDK

Prepare the PrimerCheckoutListener that will handle the callbacks that happen during the lifecycle.Import the Primer SDK and set its listener as shown in the following example.In order to use manual payment handling, you have to set paymentHandling to **PrimerPaymentHandling.MANUAL** in the PrimerSettings.

KOTLIN

class CheckoutActivity : AppCompatActivity() {

    private val listener = object : PrimerCheckoutListener {

        override fun onTokenizeSuccess(
            paymentMethodToken: PrimerPaymentMethodToken,
            decisionHandler: PrimerResumeDecisionHandler
        ) {
              // use the received paymentMethodToken to make the payment
              // and use decisionHandler to instruct SDK about next steps based on payment status
        }

        override fun onResumeSuccess(resumeToken: String, decisionHandler: PrimerResumeDecisionHandler) {
             // use the received resumeToken to resume the payment
             // and use decisionHandler to instruct SDK about next steps based on payment status
        }
    }

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        configureCheckout()
    }

    private fun configureCheckout() {
        // Set the paymentHandling to manual
        val settings = PrimerSettings(paymentHandling = PrimerPaymentHandling.MANUAL)
        Primer.instance.configure(settings, listener)
    }
}

Check the SDK API here to customize your SDK settings.

Step 3. Generate a client token

For more information on generating a client token, take a look at our client session guide.

Make an API call to your backend to fetch a Client Token. Here is a simple example of how it can be done from your activity:

KOTLIN

class CheckoutActivity : AppCompatActivity() {

    // Other code goes here

    private lateinit var viewModel: CheckoutViewModel

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        configureCheckout()
        setupViewModel()
        setupObservers()
        fetchClientToken()
    }

    private fun setupViewModel() {
        viewModel = ViewModelProvider(this).get(CheckoutViewModel::class.java)
    }

    private fun fetchClientToken() = viewModel.fetchClientToken()

    private fun setupObservers() {
        viewModel.clientToken.observe(this) { clientToken ->
            // show checkout
        }
    }
}

Your view model code may look something like this:

KOTLIN

class CheckoutViewModel : ViewModel() {

    private val _clientToken = MutableLiveData<String>()
    val clientToken: LiveData<String> = _clientToken

    fun fetchClientToken() {
        // fetch your token here (ask your backend to provide token)
        _clientToken.postValue("retrieved_token")
    }
}

Step 4. Show Universal Checkout

When the client token is retrieved, show Universal Checkout.

KOTLIN

class CheckoutActivity : AppCompatActivity() {

    // other code goes here

    private fun setupObservers() {
        viewModel.clientToken.observe(this) { clientToken ->
            showUniversalCheckout(clientToken)
        }
    }

    private fun showUniversalCheckout(clientToken: String) {
        Primer.instance.showUniversalCheckout(this, clientToken)
    }
}

You should now be able to see Universal Checkout! The user can now interact with Universal Checkout.

Step 5. Handle callbacks for creating and resuming payments

Once the payment method data has been securely captured, Primer will return a uniform paymentMethodToken via onTokenizeSuccess that can be safely passed to your server to create a payment with the Payments API.

Handle `onTokenizeSuccess` callback

When a customer submits their payment data, the payment details are tokenized and you’ll receive a paymentMethodToken in onTokenizeSuccess.
Create a payment request with the payment method token data.
If the payment is successful, call decisionHandler.handleSuccess() in order to display a success screen.
If the payment is unsuccessful, call decisionHandler.handleFailure("Your error message") to display an error / failed message.
Payments API may return a requiredAction with a new clientToken for additional steps. In this case, call decisionHandler.continueWithNewClientToken(clientToken).

KOTLIN

private val listener = object: PrimerCheckoutListener {

    override fun onTokenizeSuccess(
        paymentMethodToken: PrimerPaymentMethodToken,
        decisionHandler: PrimerResumeDecisionHandler
    ) {
        viewModel.sendPaymentMethodToken(paymentMethodToken, decisionHandler)
    }
}

KOTLIN

class CheckoutViewModel : ViewModel() {

  // ⚠️ remember to call decisionHandler to resume SDK flow.
  fun sendPaymentMethodToken(paymentMethodToken: PrimerPaymentMethodToken, decisionHandler: PrimerResumeDecisionHandler)  {
    val paymentResponse =  //...
    if (paymentResponse.isSuccessful()) {
      decisionHandler.handleSuccess()
    } else if (paymentResponse.isPending()) {
      decisionHandler.continueWithNewClientToken(paymentResponse.requiredAction.clientToken)
    } else {
      decisionHandler.handleFailure("Your error message.")
    }
  }
}

Handle `onResumeSuccess` callback

Once the required actions are completed, Primer will return resumeToken via onResumeSuccess that can be safely passed to your server to resume a payment with the Payments API.

You will receive a resumeToken via the onResumeSuccess() callback if applicable.
Send a resume payment request with resumeToken
If the payment is successful, call decisionHandler.handleSuccess() in order to display a success screen.
If the payment is unsuccessful, call decisionHandler.handleFailure("Your error message") to display an error / failed message.
Payments API may return a requiredAction with a new clientToken for additional steps. In this case, call decisionHandler.continueWithNewClientToken(clientToken).

KOTLIN

private val listener = object : PrimerCheckoutListener {

        override fun onResume(resumeToken: String, decisionHandler: PrimerResumeDecisionHandler) {
            viewModel.sendResumeToken(resumeToken, decisionHandler)
        }
    }

KOTLIN

class CheckoutViewModel : ViewModel() {

  // ⚠️ remember to call decisionHandler to resume SDK flow.
  fun sendResumeToken(resumeToken: String, decisionHandler: PrimerResumeDecisionHandler)  {
    val paymentResponse =  //...
    if (paymentResponse.isSuccessful()) {
      decisionHandler.handleSuccess()
    } else if (paymentResponse.isPending()) {
      decisionHandler.continueWithNewClientToken(paymentResponse.requiredAction.clientToken)
    } else {
      decisionHandler.handleFailure("Your error message.")
    }
  }
}

Step 1. Install

Add the following to your app/build.gradle file

Java

repositories {
  mavenCentral()
}

dependencies {
  implementation 'io.primer:android:latest.version'
}

For more details about SDK versions, please see our changelog.

Step 2. Initialize the SDK

Java

public class CheckoutActivity extends AppCompatActivity {

    private final PrimerCheckoutListener listener = new PrimerCheckoutListener() {

        @Override
        public void onTokenizeSuccess(@NonNull PrimerPaymentMethodToken primerPaymentMethodToken,
                                      @NonNull PrimerResumeDecisionHandler decisionHandler) {
              // use the received paymentMethodToken to make the payment
              // and use decisionHandler to instruct SDK about next steps based on payment status
        }

        @Override
        public void onResumeSuccess(@NonNull String resumeToken,
                             @NonNull PrimerResumeDecisionHandler decisionHandler) {
             // use the received resumeToken to resume the payment
             // and use decisionHandler to instruct SDK about next steps based on payment status
        }
    };

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        configureCheckout();
    }

    private void configureCheckout() {
        // Set the paymentHandling to manual
        PrimerSettings settings = new PrimerSettings();
        settings.setPaymentHandling(PrimerPaymentHandling.MANUAL);

        Primer.getInstance().configure(settings, listener);
    }
}

Check the SDK API here to customize your SDK settings.

Step 3. Generate a client token

For more information on generating a client token, take a look at our client session guide.

Make an API call to your backend to fetch a client token. Here is a simple example of how it can be done from your activity:

Java

public class CheckoutActivity extends AppCompatActivity {

private CheckoutViewModel viewModel;

@Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        configureCheckout();
        setupViewModel();
        setupObservers();
        fetchClientToken();
    }

    private void setupViewModel() {
        viewModel = new ViewModelProvider(this).get(CheckoutViewModel.class);
    }

    private void fetchClientToken() {
        viewModel.fetchClientToken();
    }

    private void setupObservers() {
        viewModel.clientToken.observe(this, clientToken -> {

        });
    }
}

Your view model code may look something like this:

Java

public class CheckoutViewModel extends ViewModel {

    private final MutableLiveData<String> _clientToken = new MutableLiveData<>();
    public LiveData<String> clientToken = _clientToken;

    public void fetchClientToken() {
        // fetch your token here (ask your backend to provide token)
        _clientToken.postValue("retrieved_token");
    }
}

Step 4. Show Universal Checkout

When the client token is retrieved, show Universal Checkout.

Java

public class CheckoutActivity extends AppCompatActivity {

    // other code goes here

    private void setupObservers() {
          viewModel.clientToken.observe(this, this::showUniversalCheckout);
    }

    private void showUniversalCheckout(String clientToken) {
          Primer.getInstance().showUniversalCheckout(this, clientToken);
    }
}

You should now be able to see Universal Checkout! The user can now interact with Universal Checkout.

Step 5. Handle callbacks for creating and resuming payments

Handle `onTokenizeSuccess` callback

When a customer submits their payment data, the payment details are tokenized and you’ll receive a paymentMethodToken in onTokenizeSuccess.
Create a payment request with the payment method token data.
If the payment is successful, call decisionHandler.handleSuccess() in order to display a success screen.
If the payment is unsuccessful, call decisionHandler.handleFailure("Your error message") to display an error / failed message.
Payments API may return a requiredAction with a new clientToken for additional steps. In this case, call decisionHandler.continueWithNewClientToken(clientToken).

Java

  private final PrimerCheckoutListener listener = new PrimerCheckoutListener() {

    @Override
        public void onTokenizeSuccess(@NonNull PrimerPaymentMethodToken primerPaymentMethodToken,
                                      @NonNull PrimerResumeDecisionHandler decisionHandler) {

            viewModel.sendPaymentMethodToken(primerPaymentMethodToken)
            // ⚠️ remember to call decisionHandler to resume SDK flow.
        }
    };

Handle `onResumeSuccess` callback

Once the required actions are completed, Primer will return resumeToken via onResumeSuccess that can be safely passed to your server to resume a payment with the Payments API.

You will receive a resumeToken via the onResumeSuccess() callback if applicable.
Send a resume payment request with resumeToken
If the payment is successful, call decisionHandler.handleSuccess() in order to display a success screen.
If the payment is unsuccessful, call decisionHandler.handleFailure("Your error message") to display an error / failed message.
Payments API may return a requiredAction with a new clientToken for additional steps. In this case, call decisionHandler.continueWithNewClientToken(clientToken).

Java

  private final PrimerCheckoutListener listener = new PrimerCheckoutListener() {

    @Override
        public void onResumeSuccess(@NonNull String resumeToken,
                             @NonNull PrimerResumeDecisionHandler primerResumeDecisionHandler) {
            viewModel.sendResumeToken(resumeToken)
            // ⚠️ remember to call decisionHandler to resume SDK flow.
        }
    };

Step 1. Install the SDK

With CocoaPods

The iOS SDK is available with Cocoapods. Just add the PrimerSDK pod and run pod install .

RUBY

target 'MyApp' do
  # Other pods...

  # Add this to your Podfile
  pod 'PrimerSDK', '~> 2.0.0' # Add this line
end

Then run pod install to install PrimerSDK on your workspace.For specific versions of the SDK, please refer to the changelog.

In case you encounter an error that the bundle needs signing on Xcode 14, add the following post-install script in your podfile.

RUBY

post_install do |installer|
  installer.pods_project.targets.each do |target|
    if target.respond_to?(:product_type) and target.product_type == "com.apple.product-type.bundle"
      target.build_configurations.each do |config|
          config.build_settings['CODE_SIGNING_ALLOWED'] = 'NO'
      end
    end
  end
end

With Swift Package Manager

The Swift Package Manager is a tool for automating the distribution of Swift code and is integrated into Xcode. In order to add PrimerSDK with Swift Package Manager;

Select your project, and then navigate to Package Dependencies
Click on the + button at the bottom-left of the Packages section
Paste https://github.com/primer-io/primer-sdk-ios.git into the Search Bar
Press Add Package
Let Xcode download the package and set everything up

Step 2. Initialize the SDK

Import the Primer SDK and set its delegate as shown in the following example. You have to set paymentHandling: .manual in the PrimerSettings.

SWIFT

import PrimerSDK

class MyViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()

        // Set the paymentHandling to manual.
        let settings = PrimerSettings(paymentHandling: .manual)
        Primer.shared.configure(settings: settings, delegate: self)
    }
}

extension MyViewController: PrimerDelegate {

    func primerDidTokenizePaymentMethod(_ paymentMethodTokenData: PrimerPaymentMethodTokenData, decisionHandler: @escaping (PrimerResumeDecision) -> Void) {
        // Use this method to create a payment.
    }

    func primerDidResumeWith(_ resumeToken: String, decisionHandler: @escaping (PrimerResumeDecision) -> Void) {
        // If needed, use this method to resume the previously created payment.
    }
}

Check the SDK API here to customize your SDK settings.

Step 3. Generate a client token

Check our guide on how to set up the client session here.

Make an API call to your backend to fetch a client token. Here is a simple example of how it can be done from your view controller. Once successful store your client token for future use.

SWIFT

extension MyViewController {

    func requestClientToken(data: [String: Any], completion: @escaping (String?, Error?) -> Void) {
        Networking.createClientSession(data: data) { (clientToken, err) in
            completion(clientToken, err)
        }
    }
}

Step 4. Show Universal Checkout

At this step you should have a client token available. Call the showUniversalCheckout(clientToken:) function (as shown below) to present the Universal Checkout.

SWIFT

class MyViewController: UIViewController {

    func startUniversalCheckout() {
        Primer.shared.showUniversalCheckout(clientToken: self.clientToken)
    }
}

Step 5. Handle callbacks for creating and resuming payments

Once the payment method data has been securely captured, Primer will return a uniform paymentMethodTokenData via primerDidTokenizePaymentMethod(:decisionHandler:). This can be safely passed to your server to create a payment with the Payments API.

Handle `primerDidTokenizePaymentMethod(:decisionHandler:)`

When a customer submits their payment data, the payment details are tokenized and you’ll receive a paymentMethodTokenData in primerDidTokenizePaymentMethod.
Create a payment request with the payment method token data.
If the payment is successful, call decisionHandler(.succeed()) in order to display a success screen.
If the payment is unsuccessful, call decisionHandler(.fail(withErrorMessage: "YOUR_ERROR_MESSAGE")) to display an error / failed message.
Payments API may return a requiredAction with a new clientToken for additional steps. In this case, call decisionHandler(.continueWithNewClientToken(clientToken)).

SWIFT

// use this method to create a payment.
func primerDidTokenizePaymentMethod(_ paymentMethodTokenData: PrimerPaymentMethodTokenData, decisionHandler: @escaping (PrimerResumeDecision) -> Void) {
    // ...
    // Call the resumeHandler to continue
    // ...

    // Send the payment method token data to your server to create a payment
    sendPaymentMethodToken(token: paymentMethodTokenData) { (res, err) in
        if let err = err {
            decisionHandler(.fail(withErrorMessage: "YOUR_ERROR_MESSAGE"))
        } else if let res = res {
            guard let requiredActionDic = res["requiredAction"] as? [String: Any],
                  let clientToken = requiredActionDic["clientToken"] as? String
            else {
                decisionHandler(.succeed())
                return
            }

            decisionHandler(.continueWithNewClientToken(clientToken))
        }
    }
}

Once the above operation has finished, the SDK will return an error or a new token through its delegate. You can use this token to resume the payment, i.e. send this token to your backend.

Handle `primerDidResumeWith(:decisionHandler:)`

You will receive a resumeToken via the primerDidResumeWith(:decisionHandler:) callback if applicable.
Send a resume payment request with resumeToken
If the payment is successful, call decisionHandler(.succeed()) in order to display a success screen.
If the payment is unsuccessful, call decisionHandler(.fail(withErrorMessage: "YOUR_ERROR_MESSAGE")) to display an error / failed message.
Payments API may return a requiredAction with a new clientToken for additional steps. In this case, call decisionHandler(.continueWithNewClientToken(clientToken)).

SWIFT

func primerDidResumeWith(_ resumeToken: String, decisionHandler: @escaping (PrimerResumeDecision) -> Void) {
    sendResumeToken(resumeToken) { (res, err) in
        if let err = err {
            decisionHandler(.continueWithNewClientToken(clientToken))
        } else if let res = res {
            decisionHandler(.succeed())
        }
    }
}

You should now be able to see Universal Checkout! The user can now interact with Universal Checkout, and you can create the payment.

Step 1. Turn off automatic payment creation

The Universal Checkout option paymentHandling defines how the SDK should handle payment creation.Set paymentHandling to MANUAL to turn off automatic payment handling. This will allow you to create the payment yourself (via your backend).This disables the callback onCheckoutComplete.

Typescript

import {
	Primer,
	PrimerSettings,
	PrimerCheckoutData,
	PrimerTokenizationHandler,
	PrimerResumeHandler,
	PrimerPaymentMethodTokenData,
} from '@primer-io/react-native'

const CheckoutScreen = (props: any) => {
	const onUniversalCheckoutButtonTapped = async () => {
		try {
			const settings: PrimerSettings = {
				paymentHandling: 'MANUAL',
				/* Other options and callbacks */
			}

			await Primer.configure(settings)
		} catch (err) {
			// Handle error
		}
	}
}

See our SDK API Reference for more info on available settings.

Step 2. Handle callbacks for creating and resuming payments

There are two required callbacks:

onTokenizeSuccess to create payments with paymentMethodToken
onResumeSuccess to resume payments with resumeToken

Typescript

const CheckoutScreen = (props: any) => {

  const onTokenizeSuccess: async (
    paymentMethodTokenData: PrimerPaymentMethodTokenData,
    handler: PrimerTokenizationHandler
  ) => {
    // Will be fired when the payment method has been tokenized.

    // See implementation details below
  }

  const onResumeSuccess: async (
    resumeToken: string,
    handler: PrimerResumeHandler
  ) => {
    // Will be fired if the SDK is resumed after handling an action
    // like 3DS or a redirect-based payment method.

    // See implementation details below
  }

  const onError = (
    error: PrimerError,
    checkoutData: PrimerCheckoutData | null,
    handler: PrimerErrorHandler | undefined
  ) => {
    // Handle any errors.
    // checkoutData might be null if the payment creation flow hasn't reached the payment step.
  }

  const onUniversalCheckoutButtonTapped = async () => {
    try {
      const settings: PrimerSettings = {
        paymentHandling: "MANUAL",
        /* Other options... */
        onTokenizeSuccess,
        onResumeSuccess,
        onError,
      }

      await Primer.configure(settings);

    } catch (err) {
      // Handle error
    }
  };
}

See our SDK API Reference for the full list of callbacks.

Handle `onTokenizeSuccess()` callback

When a customer submits their payment data, the payment details are tokenized and you’ll receive a PrimerPaymentMethodTokenData object in onTokenizeSuccess()
Create a payment request with the token of the PrimerPaymentMethodTokenData received.
If the payment is successful, call handler.handleSuccess() in order to display a success screen.
If the payment is unsuccessful, call handler.handleFailure(errorMessage) to display an error / failed message.
Payments API may return a new clientToken for additional steps (in the requiredActions on the response). In this case, call handler.continueWithNewClientToken(clientToken) to the checkout.

See below for an example integration:

Typescript

const onTokenizeSuccess: async (
		paymentMethodTokenData: PrimerPaymentMethodTokenData,
	  handler: PrimerTokenizationHandler
	) => {
			// Make an API call to your backend to create a payment.
			try {
				const paymentResponse = await createPayment(paymentMethodTokenData.token);

				// If the request failed you can cancel the flow and display an error message
        if (!paymentResponse) {
            handler.handleFailure('The payment failed. Please try with another payment method.');
						return;
        }

				// If the payment has any actions for the SDK to complete
				if (paymentResponse.requiredAction?.clientToken) {
					this.paymentId = paymentResponse.id;  // This will be used for resuming later
					handler.continueWithNewClientToken(paymentResponse.requiredAction.clientToken);
					return;
				}

				// Display the success screen
        handler.handleSuccess();
				return;

			} catch (error) {
				// Handle error
			}
	}

Handle `onResumeSuccess()` callback

Handling onResumeSuccess() is required to fully support 3DS and the majority of payment methods.

You will receive a resumeToken via the onResumeSuccess() callback if applicable
Send a resume payment request with the resumeToken
If the payment is successful, call handler.handleSuccess() in order to display a success screen.
If the payment is unsuccessful, call handler.handleFailure(errorMessage) to display an error / failed message.
Payments API may again return a new clientToken for additional steps. In this case, call handler.continueWithNewClientToken(clientToken) to the checkout.

Typescript

const onResumeSuccess: async (
	  resumeToken: string,
	  handler: PrimerResumeHandler
	) => {
			// Make an API call to resume the payment.
			try {
				const resumePaymentResponse = await resumePayment(this.paymentId, resumeToken);

				// If the request failed you can cancel the flow and display an error message
        if (!resumePaymentResponse) {
            handler.handleFailure('The payment failed. Please try with another payment method.');
						return;
        }

        // The checkout will automatically perform the action required by the Workflow
        if (resumePaymentResponse.requiredAction?.clientToken) {
            handler.continueWithNewClientToken(resumePaymentResponse.requiredAction.clientToken);
						return;
        }

        // Display the success screen
        handler.handleSuccess();
				return;

			} catch (error) {
				// Handle error
			}
	}

Step 3. Generate a client token

Make an API call to your backend to generate a Client Session. The Client Session request returns a client token, which you will need to initialize the checkout.Here is an example of how it can be done from your component. Once successful, store your client token for future use.

Typescript

const CheckoutScreen = (props: any) => {
	// ...

	const onUniversalCheckoutButtonTapped = async () => {
		try {
			// ...
			// Ask your backend to create a client session
			const clientToken = await createClientSession()
		} catch (err) {
			// Handle error
		}
	}
}

Step 4. Show Universal Checkout

At this point, you should have a client token available. To present Universal Checkout, call showUniversalCheckout(clientToken) as shown below.

Typescript

const CheckoutScreen = async (props: any) => {
	// ...

	const onUniversalCheckoutButtonTapped = async () => {
		// ...

		try {
			// Present Universal Checkout
			await Primer.showUniversalCheckout(clientToken)
		} catch (err) {
			// Handle error
		}
	}
}

You should now be able to see Universal Checkout, and the user can now interact with it. When the user tries to pay, we will tokenize the payment method and invoke onTokenizeSuccess. You can then create the payment as mentioned in Step 4.

Full Snippet

Typescript

import {
		Primer,
		PrimerSettings,
		PrimerCheckoutData,
		PrimerTokenizationHandler,
		PrimerResumeHandler,
		PrimerPaymentMethodTokenData
} from '@primer-io/react-native'

const CheckoutScreen = (props: any) => {

	const onTokenizeSuccess: async (
		paymentMethodTokenData: PrimerPaymentMethodTokenData,
	  handler: PrimerTokenizationHandler
	) => {
			try {
				const paymentResponse = await createPayment(paymentMethodTokenData.token);

        if (!paymentResponse) {
            handler.handleFailure('The payment failed. Please try with another payment method.');
						return;
        }

				if (paymentResponse.requiredAction?.clientToken) {
					this.paymentId = paymentResponse.id;  // This will be used for resuming later
					handler.continueWithNewClientToken(paymentResponse.requiredAction.clientToken);
					return;
				}

        handler.handleSuccess();
				return;

			} catch (error) {
				// Handle error
			}
	}

	const onResumeSuccess: async (
	  resumeToken: string,
	  handler: PrimerResumeHandler
	) => {
			try {
				const resumePaymentResponse = await resumePayment(this.paymentId, resumeToken);

        if (!resumePaymentResponse) {
            handler.handleFailure('The payment failed. Please try with another payment method.');
						return;
        }

        if (resumePaymentResponse.requiredAction?.clientToken) {
            handler.continueWithNewClientToken(resumePaymentResponse.requiredAction.clientToken);
						return;
        }

        handler.handleSuccess();
				return;

			} catch (error) {
				// Handle error
			}
	}

	const onError = (
    error: PrimerError,
    checkoutData: PrimerCheckoutData | null,
    handler: PrimerErrorHandler | undefined
  ) => {
			// Handle the error
	}

  const onUniversalCheckoutButtonTapped = async () => {
    try {
      const settings: PrimerSettings = {
        paymentHandling: "MANUAL",
        /* Other options... */
        onTokenizeSuccess,
        onResumeSuccess,
        onError
      }

      await Primer.configure(settings);

      const clientToken = await createClientSession();

      await Primer.showUniversalCheckout(clientToken)
    } catch (err) {
      // Handle error
    }
  };
}

Checkout

​Overview

​Flow

​Generate a Client Token

​Get an API Key

​Generate a Client Session

​Set up Universal Checkout

​Step 1. Turn off automatic payment creation

​Step 2. Handle callbacks for creating and resuming payments

​Handle onTokenizeSuccess() callback

​Handle onResumeSuccess() callback

​Step 1. Install

​Step 2. Initialize the SDK

​Step 3. Generate a client token

​Step 4. Show Universal Checkout

​Step 5. Handle callbacks for creating and resuming payments

​Handle onTokenizeSuccess callback

​Handle onResumeSuccess callback

​Step 1. Install

​Step 2. Initialize the SDK

​Step 3. Generate a client token

​Step 4. Show Universal Checkout

​Step 5. Handle callbacks for creating and resuming payments

​Handle onTokenizeSuccess callback

​Handle onResumeSuccess callback

​Step 1. Install the SDK

​With CocoaPods

​With Swift Package Manager

​Step 2. Initialize the SDK

​Step 3. Generate a client token

​Step 4. Show Universal Checkout

​Step 5. Handle callbacks for creating and resuming payments

​Handle primerDidTokenizePaymentMethod(:decisionHandler:)

​Handle primerDidResumeWith(:decisionHandler:)

​Step 1. Turn off automatic payment creation

​Step 2. Handle callbacks for creating and resuming payments

​Handle onTokenizeSuccess() callback

​Handle onResumeSuccess() callback

​Step 3. Generate a client token

​Step 4. Show Universal Checkout

​Full Snippet

Overview

Flow

Generate a Client Token

Get an API Key

Generate a Client Session

Set up Universal Checkout

Step 1. Turn off automatic payment creation

Step 2. Handle callbacks for creating and resuming payments

Handle `onTokenizeSuccess()` callback

Handle `onResumeSuccess()` callback

Step 1. Install

Step 2. Initialize the SDK

Step 3. Generate a client token

Step 4. Show Universal Checkout

Step 5. Handle callbacks for creating and resuming payments

Handle `onTokenizeSuccess` callback

Handle `onResumeSuccess` callback

Step 1. Install

Step 2. Initialize the SDK

Step 3. Generate a client token

Step 4. Show Universal Checkout

Step 5. Handle callbacks for creating and resuming payments

Handle `onTokenizeSuccess` callback

Handle `onResumeSuccess` callback

Step 1. Install the SDK

With CocoaPods

With Swift Package Manager

Step 2. Initialize the SDK

Step 3. Generate a client token

Step 4. Show Universal Checkout

Step 5. Handle callbacks for creating and resuming payments

Handle `primerDidTokenizePaymentMethod(:decisionHandler:)`

Handle `primerDidResumeWith(:decisionHandler:)`

Step 1. Turn off automatic payment creation

Step 2. Handle callbacks for creating and resuming payments

Handle `onTokenizeSuccess()` callback

Handle `onResumeSuccess()` callback

Step 3. Generate a client token

Step 4. Show Universal Checkout

Full Snippet