dependencies {
    implementation("com.braintreepayments.api:paypal:5.2.0")
}

dependencies {
    implementation("com.braintreepayments.api:paypal:4.49.1")
}

override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState);

    // PayPalLauncher must be initialized in onCreate
    payPalLauncher = PayPalLauncher();
    // can initialize the PayPalClient outside of onCreate if desired
    payPalClient = PayPalClient(
        context = this,
        authorization = "[TOKENIZATION_KEY or CLIENT_TOKEN]",
        appLinkReturnUrl = Uri.parse("https://merchant-app.com") // Merchant App Link
    );
}

private fun onPayPalButtonClick() {
    val payPalCheckoutRequest = PayPalCheckoutRequest(
        amount = "12.34",
        hasUserLocationConsent = true
    );
    payPalClient.createPaymentAuthRequest(this, payPalCheckoutRequest) { paymentAuthRequest ->
        when (paymentAuthRequest) {
            is PayPalPaymentAuthRequest.ReadyToLaunch -> {
                val pendingRequest = payPalLauncher.launch(this, paymentAuthRequest);
                when (pendingRequest) {
                    is PayPalPendingRequest.Started -> {
                        <sdkmatcher sdk="android:v4">
                        First, make sure you have <a href="/braintree/docs/guides/client-sdk/setup/android/v4/#browser-switch-setup">defined your URL scheme</a>.
                        Next, create a BraintreeClient with a <a href="/braintree/docs/guides/client-sdk/setup/android/v4/#client-token-provider">ClientTokenProvider</a> or Tokenization Key.
                        Construct a PayPalClient and implement a PayPalListener to receive results.
                        Call PayPalClient#tokenizePayPalAccount to launch the PayPal flow.
                        An example integration might look like this:
                        <codeblocktabs>
                        <codeblocktab label="Java">
                        <codeblock class="language-java">
                        public class MyActivity extends AppCompatActivity implements PayPalListener {
                            private BraintreeClient braintreeClient;
                            private PayPalClient payPalClient;
                            @Override
                            protected void onCreate(Bundle savedInstanceState) {
                                super.onCreate(savedInstanceState);
                                braintreeClient = new BraintreeClient(this, new ExampleClientTokenProvider());
                                payPalClient = new PayPalClient(this, braintreeClient);
                                payPalClient.setListener(this);
                            }
                            private void myTokenizePayPalAccountWithCheckoutMethod() {
                                PayPalCheckoutRequest request = new PayPalCheckoutRequest("1.00");
                                request.setCurrencyCode("USD");
                                payPalClient.tokenizePayPalAccount(this, request);
                            }
                            @Override
                            public void onPayPalSuccess(@NonNull PayPalAccountNonce payPalAccountNonce) {
                                // send payPalAccountNonce.getString() to server
                            }
                            @Override
                            public void onPayPalFailure(@NonNull Exception error) {
                                if (error instanceof UserCanceledException) {
                                    // user canceled
                                } else {
                                    // handle error
                                }
                            }
                        };
                        </codeblock>
                    }
                }
            }
        }
    }
}

class MyActivity : AppCompatActivity(), PayPalListener {
    private lateinit var braintreeClient: BraintreeClient;
    private lateinit var payPalClient: PayPalClient;

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState);
        braintreeClient = BraintreeClient(this, ExampleClientTokenProvider());
        payPalClient = PayPalClient(this, braintreeClient);
        payPalClient.setListener(this);
    }

    private fun myTokenizePayPalAccountWithCheckoutMethod() {
        val request = PayPalCheckoutRequest("1.00");
        request.currenyCode = "USD";
        payPalClient.tokenizePayPalAccount(this, request);
    }

    override fun onPayPalSuccess(payPalAccountNonce: PayPalAccountNonce) {
        // send payPalAccountNonce.string to server
    }

    override fun onPayPalError(error: Exception) {
        if (error is UserCanceledException) {
            // user canceled
        } else {
            // handle error
        }
    }
}

public class MyActivity extends AppCompatActivity {
    @Override
    protected void onNewIntent(Intent newIntent) {
        super.onNewIntent(newIntent);
        setIntent(newIntent);
    }
}