1、使用cocoapods

   pod'PayPal-iOS-SDK'

2、AppDelegate 中key 的设置

   [PayPalMobile initializeWithClientIdsForEnvironments:@{PayPalEnvironmentProduction:PAYPAL_PRODUCTION,PayPalEnvironmentSandbox:PAYPAL_SANDBOX}];

3、设置支付环境

  [PayPalMobile preconnectWithEnvironment:PayPalEnvironmentProduction];

PayPalEnvironmentProduction  正式环境

 PayPalEnvironmentSandbox

 PayPalEnvironmentNoNetwork

4、付款页面

一、@property(nonatomic, strong, readwrite) PayPalConfiguration *payPalConfig;

二、实现代理 PayPalPaymentDelegate

三、点击付款

- (void)onClickPayPalButtonAction:(NSString *)orderId{

    _payPalConfig = [[PayPalConfiguration alloc] init];

    _payPalConfig.acceptCreditCards = NO;

    _payPalConfig.languageOrLocale = [NSLocale preferredLanguages][0];

    NSString*priceString =grand_total;

    NSDecimalNumber*total = [NSDecimalNumberdecimalNumberWithString:priceString];

    PayPalPayment *payment = [[PayPalPayment alloc] init];

    payment.amount= total;

    payment.currencyCode = currency_info.code;

    payment.shortDescription=@"order summary";

    payment.custom=orderId;//self.order.order_no;

    //  payment.shippingAddress=  [PayPalShippingAddress shippingAddressWithRecipientName:@"1" withLine1:@"2" withLine2:@"3" withCity:@"3" withState:@"3" withPostalCode:@"4" withCountryCode:@"5"];

    PayPalPaymentViewController *paymentViewController = [[PayPalPaymentViewController alloc]initWithPayment:payment configuration:self.payPalConfig delegate:self];

    paymentViewController.modalPresentationStyle = UIModalPresentationOverFullScreen;

    [self presentViewController:paymentViewController animated:YES completion:nil];

}

五、付款后代理方法 PayPalPaymentDelegate methods

- (void)payPalPaymentViewController:(PayPalPaymentViewController*)paymentViewControllerdidCompletePayment:(PayPalPayment*)completedPayment {

    NSLog(@"PayPal Payment Success!");

      [self dismissViewControllerAnimated:YES completion:nil];

        [MBProgressHUD showSuccess:@"PayPal Payment Success!" toView:self.view];

    dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(2.0 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{

        PaySuccess*pay=[[PaySuccessalloc]init];

        pay.order_id=completedPayment.custom;

        [self.navigationController pushViewController:pay animated:YES];

              });

}

- (void)payPalPaymentDidCancel:(PayPalPaymentViewController*)paymentViewController {

    NSLog(@"PayPal Payment Canceled");

      [self dismissViewControllerAnimated:YES completion:nil];

       dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(2.0 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{

            [MBProgressHUD showSuccess:@"PayPal Payment failed!" toView:self.view];

                 });

}