问在iOS中处理给用户的付款

EN

     UIButton checkOutBtn=[[PayPal getPayPalInst] getPayButtonWithTarget:self andAction:@selector(payWithPayPal) andButtonType:BUTTON_152x33 andButtonText:BUTTON_TEXT_PAY];
     checkOutBtn.frame=CGRectMake(60, 100, 200, 45);
     [self.view addSubview:checkOutBtn];  

    -(void) payWithPayPal
    {
           [PayPal getPayPalInst].shippingEnabled=TRUE;
           [PayPal getPayPalInst].dynamicAmountUpdateEnabled=TRUE;
           [PayPal getPayPalInst].feePayer=FEEPAYER_EACHRECEIVER;

           PayPalPayment *payment=[[[PayPalPayment alloc] init] autorelease];
           payment.recipient=@"xyz@paypal.com";
           payment.paymentCurrency=@"USD";

           payment.description = @"Paypal";
           payment.merchantName = @"Title Name";

           //subtotal of all items, without tax and shipping

           payment.subTotal = [NSDecimalNumber decimalNumberWithString:[NSString stringWithFormat:@"%1.2f", 5320.50 ]];   // total Price

          //invoiceData is a PayPalInvoiceData object which contains tax, shipping, and a list of PayPalInvoiceItem objects

           payment.invoiceData = [[[PayPalInvoiceData alloc] init] autorelease];
           payment.invoiceData.totalShipping = [NSDecimalNumber decimalNumberWithString:@"2"];   // Shipping Cost
           payment.invoiceData.totalTax = [NSDecimalNumber decimalNumberWithString:@"0.35"];   // Tax On Product

           //invoiceItems is a list of PayPalInvoiceItem objects
           //NOTE: sum of totalPrice for all items must equal payment.subTotal

           payment.invoiceData.invoiceItems = [NSMutableArray array];
           PayPalInvoiceItem *item = [[[PayPalInvoiceItem alloc] init] autorelease];

           item.totalPrice = payment.subTotal;
           item.name = @"Product Name";
           [payment.invoiceData.invoiceItems addObject:item];

           [[PayPal getPayPalInst] checkoutWithPayment:payment];
    }

    -(void)paymentSuccessWithKey:(NSString *)payKey andStatus:(PayPalPaymentStatus)paymentStatus
    {
           NSLog(@"Successfully Paid");
    }
    -(void)paymentCanceled
    {
           NSLog(@"Cancelled");
    }
    - (void)paymentFailedWithCorrelationID:(NSString *)correlationID
    {
           NSLog(@"Failed");
    }
    -(void)paymentLibraryExit
    {
           NSLog(@"Exit");
    }