Paypal payment gateway integration android

A payment gateway is an e-commerce application service provider service that authorizes credit card payments for e-businesses, online retailers, bricks and clicks, or traditional brick and mortar.

build.gradle

buildscript {
    repositories {
        mavenCentral()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:2.0.0'
    }
}

repositories {
    maven {
        // Used for downloading dependency com.github.lkorth:device-automator
        url "https://jitpack.io"
    }
    mavenCentral()
}
apply plugin: 'com.android.application'

android {
    compileSdkVersion 23
    buildToolsVersion "23.0.3"

    defaultConfig {
        applicationId "com.samset.paypalintegrationsample"
        minSdkVersion 18
        targetSdkVersion 23
        versionCode 1
        versionName "1.0"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }

    // Only for SampleApp.
    // It is failing because the okio version and okhttp is not found, which is expected.
    lintOptions {
        abortOnError false
    }

    productFlavors {
        general
        partner
    }
    configurations.all {
        resolutionStrategy.force 'com.android.support:support-annotations:23.0.1'
    }
}

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    testCompile 'junit:junit:4.12'
    compile 'com.android.support:appcompat-v7:23.3.0'
    compile('com.paypal.sdk:paypal-android-sdk:2.14.2')
    compile 'com.google.android.gms:play-services-wallet:8.4.0'
    testCompile 'com.android.support.test.espresso:espresso-core:2.2.1'
    androidTestCompile 'com.github.lkorth:device-automator:30238040d8'
    testCompile 'com.google.dexmaker:dexmaker-mockito:1.1'
    testCompile 'com.android.support.test.espresso:espresso-intents:2.2.1'
    testCompile 'com.android.support.test.espresso:espresso-web:2.2.1'
    testCompile 'com.android.support.test:runner:0.4.1'
    testCompile 'com.android.support.test:rules:0.4.1'
}

actvity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:background="#a3cdc9"
    tools:context="com.samset.paypalintegrationsample.MainActivity">
    <TextView
        android:textSize="20dp"
        android:layout_marginTop="20dp"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:textAppearance="?android:attr/textAppearanceSmall"
        android:text="Welcome to paypal gateway"
        android:textColor="#fff"
        android:id="@+id/txt" />
    <LinearLayout
        android:layout_marginTop="20dp"
        android:layout_below="@+id/txt"
        android:id="@+id/wrapper"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_alignParentRight="true"
        android:layout_centerVertical="true"
        android:orientation="vertical" >

        <Button
            android:background="#4e5c56"
            android:id="@+id/buyItBtn"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="20dp"
            android:onClick="onBuyPressed"
            android:textColor="#fff"
            android:text="Buy Now" />

        <Button
            android:background="#4e5c56"
            android:id="@+id/futurePaymentBtn"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="20dp"
            android:textColor="#fff"
            android:onClick="onFuturePaymentPressed"
            android:text="Future Payment Consent" />


        <TextView
            android:layout_marginTop="20dp"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textAppearance="?android:attr/textAppearanceSmall"
            android:text=""
            android:textColor="#fff"
            android:id="@+id/txtResult" />
    </LinearLayout>
</RelativeLayout>

ActvityMain.java

import android.app.Activity;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.support.v7.widget.AppCompatButton;
import android.util.Log;
import android.view.View;
import android.widget.TextView;
import android.widget.Toast;

import com.paypal.android.sdk.payments.PayPalAuthorization;
import com.paypal.android.sdk.payments.PayPalConfiguration;
import com.paypal.android.sdk.payments.PayPalFuturePaymentActivity;
import com.paypal.android.sdk.payments.PayPalItem;
import com.paypal.android.sdk.payments.PayPalOAuthScopes;
import com.paypal.android.sdk.payments.PayPalPayment;
import com.paypal.android.sdk.payments.PayPalPaymentDetails;
import com.paypal.android.sdk.payments.PayPalProfileSharingActivity;
import com.paypal.android.sdk.payments.PayPalService;
import com.paypal.android.sdk.payments.PaymentActivity;
import com.paypal.android.sdk.payments.PaymentConfirmation;
import com.paypal.android.sdk.payments.ShippingAddress;

import org.json.JSONException;

import java.math.BigDecimal;
import java.util.Arrays;
import java.util.HashSet;
import java.util.Set;


public class SampleActivity extends Activity {
    private static final String TAG = "paymentExample";


    private static final String CONFIG_ENVIRONMENT = PayPalConfiguration.ENVIRONMENT_NO_NETWORK;

    // note that these credentials will differ between live & sandbox environments.
    private static final String CONFIG_CLIENT_ID = "credentials from developer.paypal.com";

    private static final int REQUEST_CODE_PAYMENT = 1;
    private static final int REQUEST_CODE_FUTURE_PAYMENT = 2;
    private static final int REQUEST_CODE_PROFILE_SHARING = 3;
       private AppCompatButton buynow;
    private static PayPalConfiguration config = new PayPalConfiguration()
            .environment(CONFIG_ENVIRONMENT)
            .clientId(CONFIG_CLIENT_ID)
            // The following are only used in PayPalFuturePaymentActivity.
            .merchantName("Sample Merchant")
            .merchantPrivacyPolicyUri(Uri.parse("https://www.example.com/privacy"))
            .merchantUserAgreementUri(Uri.parse("https://www.example.com/legal"));

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


        Intent intent = new Intent(this, PayPalService.class);
        intent.putExtra(PayPalService.EXTRA_PAYPAL_CONFIGURATION, config);
        startService(intent);


    }


    public void buyNow(View view) {

        Log.e("Main"," You click ");
        PayPalPayment thingToBuy = getThingToBuy(PayPalPayment.PAYMENT_INTENT_SALE);

        /*
         * See getStuffToBuy(..) for examples of some available payment options.
         */

        Intent intent = new Intent(SampleActivity.this, PaymentActivity.class);
        // send the same configuration for restart resiliency
        intent.putExtra(PayPalService.EXTRA_PAYPAL_CONFIGURATION, config);
        intent.putExtra(PaymentActivity.EXTRA_PAYMENT, thingToBuy);
        startActivityForResult(intent, REQUEST_CODE_PAYMENT);
    }
   
    private PayPalPayment getThingToBuy(String paymentIntent) {
        return new PayPalPayment(new BigDecimal("0.01"), "USD", "Sample Item",paymentIntent);
    }
   
    /*
     * This method shows use of optional payment details and item list.
     */
    private PayPalPayment getStuffToBuy(String paymentIntent) {
        //--- include an item list, payment amount details
        PayPalItem[] items =
            {
                    new PayPalItem("sample item #1", 2, new BigDecimal("87.50"), "USD",
                            "sku-12345678"),
                    new PayPalItem("free sample item #2", 1, new BigDecimal("0.00"),
                            "USD", "sku-zero-price"),
                    new PayPalItem("sample item #3 with a longer name", 6, new BigDecimal("37.99"),
                            "USD", "sku-33333")
            };
        BigDecimal subtotal = PayPalItem.getItemTotal(items);
        BigDecimal shipping = new BigDecimal("7.21");
        BigDecimal tax = new BigDecimal("4.67");
        PayPalPaymentDetails paymentDetails = new PayPalPaymentDetails(shipping, subtotal, tax);
        BigDecimal amount = subtotal.add(shipping).add(tax);
        PayPalPayment payment = new PayPalPayment(amount, "USD", "sample item", paymentIntent);
        payment.items(items).paymentDetails(paymentDetails);

        //--- set other optional fields like invoice_number, custom field, and soft_descriptor
        payment.custom("This is text that will be associated with the payment that the app can use.");

        return payment;
    }
   
    /*
     * Add app-provided shipping address to payment
     */
    private void addAppProvidedShippingAddress(PayPalPayment paypalPayment) {
        ShippingAddress shippingAddress =new ShippingAddress().recipientName("Mom Parker").line1("52 North Main St.")
                        .city("Austin").state("TX").postalCode("78729").countryCode("US");
        paypalPayment.providedShippingAddress(shippingAddress);
    }

    /*
     * Enable retrieval of shipping addresses from buyer's PayPal account
     */
    private void enableShippingAddressRetrieval(PayPalPayment paypalPayment, boolean enable) {
        paypalPayment.enablePayPalShippingAddressesRetrieval(enable);
    }

    public void onFuturePaymentPressed(View pressed) {
        Intent intent = new Intent(SampleActivity.this, PayPalFuturePaymentActivity.class);

        // send the same configuration for restart resiliency
        intent.putExtra(PayPalService.EXTRA_PAYPAL_CONFIGURATION, config);

        startActivityForResult(intent, REQUEST_CODE_FUTURE_PAYMENT);
    }

    public void onProfileSharingPressed(View pressed) {
        Intent intent = new Intent(SampleActivity.this, PayPalProfileSharingActivity.class);

        // send the same configuration for restart resiliency
        intent.putExtra(PayPalService.EXTRA_PAYPAL_CONFIGURATION, config);

        intent.putExtra(PayPalProfileSharingActivity.EXTRA_REQUESTED_SCOPES, getOauthScopes());

        startActivityForResult(intent, REQUEST_CODE_PROFILE_SHARING);
    }

    private PayPalOAuthScopes getOauthScopes() {
        /* create the set of required scopes
         * Note: see https://developer.paypal.com/docs/integration/direct/identity/attributes/ for mapping between the
         * attributes you select for this app in the PayPal developer portal and the scopes required here.
         */
        Set<String> scopes = new HashSet<String>(
                Arrays.asList(PayPalOAuthScopes.PAYPAL_SCOPE_EMAIL, PayPalOAuthScopes.PAYPAL_SCOPE_ADDRESS) );
        return new PayPalOAuthScopes(scopes);
    }

    protected void displayResultText(String result) {
        ((TextView)findViewById(R.id.txtResult)).setText("Result : " + result);
        Toast.makeText(
                getApplicationContext(),
                result, Toast.LENGTH_LONG)
                .show();
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        if (requestCode == REQUEST_CODE_PAYMENT) {
            if (resultCode == Activity.RESULT_OK) {
                PaymentConfirmation confirm =
                        data.getParcelableExtra(PaymentActivity.EXTRA_RESULT_CONFIRMATION);
                if (confirm != null) {
                    try {
                        Log.i(TAG, confirm.toJSONObject().toString(4));
                        Log.i(TAG, confirm.getPayment().toJSONObject().toString(4));
                        displayResultText("PaymentConfirmation info received from PayPal");

                    } catch (JSONException e) {
                        Log.e(TAG, "an extremely unlikely failure occurred: ", e);
                    }
                }
            } else if (resultCode == Activity.RESULT_CANCELED) {
                Log.i(TAG, "The user canceled.");
            } else if (resultCode == PaymentActivity.RESULT_EXTRAS_INVALID) {
                Log.i(
                        TAG,
                        "An invalid Payment or PayPalConfiguration was submitted. Please see the docs.");
            }
        } else if (requestCode == REQUEST_CODE_FUTURE_PAYMENT) {
            if (resultCode == Activity.RESULT_OK) {
                PayPalAuthorization auth =
                        data.getParcelableExtra(PayPalFuturePaymentActivity.EXTRA_RESULT_AUTHORIZATION);
                if (auth != null) {
                    try {
                        Log.i("FuturePaymentExample", auth.toJSONObject().toString(4));

                        String authorization_code = auth.getAuthorizationCode();
                        Log.i("FuturePaymentExample", authorization_code);

                        sendAuthorizationToServer(auth);
                        displayResultText("Future Payment code received from PayPal");

                    } catch (JSONException e) {
                        Log.e("FuturePaymentExample", "an extremely unlikely failure occurred: ", e);
                    }
                }
            } else if (resultCode == Activity.RESULT_CANCELED) {
                Log.i("FuturePaymentExample", "The user canceled.");
            } else if (resultCode == PayPalFuturePaymentActivity.RESULT_EXTRAS_INVALID) {
                Log.i(
                        "FuturePaymentExample",
                        "Probably the attempt to previously start the PayPalService had an invalid PayPalConfiguration. Please see the docs.");
            }
        } else if (requestCode == REQUEST_CODE_PROFILE_SHARING) {
            if (resultCode == Activity.RESULT_OK) {
                PayPalAuthorization auth =
                        data.getParcelableExtra(PayPalProfileSharingActivity.EXTRA_RESULT_AUTHORIZATION);
                if (auth != null) {
                    try {
                        Log.i("ProfileSharingExample", auth.toJSONObject().toString(4));

                        String authorization_code = auth.getAuthorizationCode();
                        Log.i("ProfileSharingExample", authorization_code);

                        sendAuthorizationToServer(auth);
                        displayResultText("Profile Sharing code received from PayPal");

                    } catch (JSONException e) {
                        Log.e("ProfileSharingExample", "an extremely unlikely failure occurred: ", e);
                    }
                }
            } else if (resultCode == Activity.RESULT_CANCELED) {
                Log.i("ProfileSharingExample", "The user canceled.");
            } else if (resultCode == PayPalFuturePaymentActivity.RESULT_EXTRAS_INVALID) {
                Log.i(
                        "ProfileSharingExample",
                        "Probably the attempt to previously start the PayPalService had an invalid PayPalConfiguration. Please see the docs.");
            }
        }
    }

    private void sendAuthorizationToServer(PayPalAuthorization authorization) {

        /**
         * TODO: Send the authorization response to your server, where it can
         * exchange the authorization code for OAuth access and refresh tokens.
         *
         * Your server must then store these tokens, so that your server code
         * can execute payments for this user in the future.
         *
         * A more complete example that includes the required app-server to
         * PayPal-server integration is available from
         * https://github.com/paypal/rest-api-sdk-python/tree/master/samples/mobile_backend
         */

    }

    public void onFuturePaymentPurchasePressed(View pressed) {
        // Get the Client Metadata ID from the SDK
        String metadataId = PayPalConfiguration.getClientMetadataId(this);

        Log.i("FuturePaymentExample", "Client Metadata ID: " + metadataId);

        // TODO: Send metadataId and transaction details to your server for processing with
        // PayPal...
        displayResultText("Client Metadata Id received from SDK");
    }

    @Override
    public void onDestroy() {
        // Stop service when done
        stopService(new Intent(this, PayPalService.class));
        super.onDestroy();
    }
}

Thank you

I hope this blog very helps you

Full Source code Paypalpaymentgateway-android

Live Sample