在你的 Android 程式碼中設定 paypal

1）首先通過 Paypal Developer 網站建立一個應用程式。

2）現在開啟你的清單檔案並提供以下許可權

<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />

3）一些必需的活動和服務 -

 <service
        android:name="com.paypal.android.sdk.payments.PayPalService"
        android:exported="false" />
    <activity android:name="com.paypal.android.sdk.payments.PaymentActivity" />
    <activity android:name="com.paypal.android.sdk.payments.LoginActivity" />
    <activity android:name="com.paypal.android.sdk.payments.PaymentMethodActivity" />
    <activity android:name="com.paypal.android.sdk.payments.PaymentConfirmActivity" />
    <activity android:name="com.paypal.android.sdk.payments.PayPalFuturePaymentActivity" />
    <activity android:name="com.paypal.android.sdk.payments.FuturePaymentConsentActivity" />
    <activity android:name="com.paypal.android.sdk.payments.FuturePaymentInfoActivity" />
    <activity
        android:name="io.card.payment.CardIOActivity"
        android:configChanges="keyboardHidden|orientation" />
    <activity android:name="io.card.payment.DataEntryActivity" />

4）開啟你的 Activity 類併為你的 app 設定配置 -

//set the environment for production/sandbox/no netowrk
 private static final String CONFIG_ENVIRONMENT = PayPalConfiguration.ENVIRONMENT_PRODUCTION;

5）現在從 Paypal 開發者帳戶設定客戶端 ID - 私有靜態最終字串 CONFIG_CLIENT_ID =“輸出你的客戶 ID”; 6）在 onCreate 方法中呼叫 Paypal 服務 - Intent intent = new Intent（this，PayPalService.class）; intent.putExtra（PayPalService.EXTRA_PAYPAL_CONFIGURATION，config）; startService（意向）;

7）現在你已準備好按下按鈕按下付款活動 -

PayPalPayment thingToBuy = new PayPalPayment(new BigDecimal(1),"USD", "androidhub4you.com",
                                 PayPalPayment.PAYMENT_INTENT_SALE);
                             Intent intent = new Intent(MainActivity.this, PaymentActivity.class);
                             intent.putExtra(PaymentActivity.EXTRA_PAYMENT, thingToBuy);

                             startActivityForResult(intent, REQUEST_PAYPAL_PAYMENT);    

8）最後從 onActivityResult 獲得付款響應 -

 @Override
           protected void onActivityResult(int requestCode, int resultCode, Intent data) {
               if (requestCode == REQUEST_PAYPAL_PAYMENT) {
                   if (resultCode == Activity.RESULT_OK) {
                       PaymentConfirmation confirm = data
                               .getParcelableExtra(PaymentActivity.EXTRA_RESULT_CONFIRMATION);
                       if (confirm != null) {
                           try {
                           System.out.println("Responseeee"+confirm);
                               Log.i("paymentExample", confirm.toJSONObject().toString());
                            
                               JSONObject jsonObj=new JSONObject(confirm.toJSONObject().toString());
                              
                               String paymentId=jsonObj.getJSONObject("response").getString("id");
                               System.out.println("payment id:-=="+paymentId);
                               Toast.makeText(getApplicationContext(), paymentId, Toast.LENGTH_LONG).show(); 
                           } catch (JSONException e) {
                               Log.e("paymentExample", "an extremely unlikely failure occurred: ", e);
                           }
                       }
                   } else if (resultCode == Activity.RESULT_CANCELED) {
                       Log.i("paymentExample", "The user canceled.");
                   } else if (resultCode == PaymentActivity.RESULT_EXTRAS_INVALID) {
                       Log.i("paymentExample", "An invalid Payment was submitted. Please see the docs.");
                   }
               }
              
               
         }