Hello Readers

To integrate PayPal in an ios application for future payment , the following steps need to be followed:

Step 1: Download the PayPal ios sdk from the link given below: [https://github.com/paypal/PayPal-iOS-SDK][1]

Step 2 : Import the "PayPalMobile.h" header file in the ViewController and implement the delegate methods.

In the appdelegate file add the following line of code in

   - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions{
[PayPalMobile initializeWithClientIdsForEnvironments:@{ PayPalEnvironmentSandbox : ClientId}];

where Client id is obtained from the app created on PayPal developer(developer.paypal.com).

Step 3: Send the authorization code recieved to your server for further processing:

- (void)payPalFuturePaymentViewController:(PayPalFuturePaymentViewController *)futurePaymentViewController
                didAuthorizeFuturePayment:(NSDictionary *)futurePaymentAuthorization {
    NSLog(@"PayPal Future Payment Authorization Success!");

    [self sendFuturePaymentAuthorizationToServer:futurePaymentAuthorization];
    [self dismissViewControllerAnimated:YES completion:nil];
}

- (void)payPalFuturePaymentDidCancel:(PayPalFuturePaymentViewController *)futurePaymentViewController {
    NSLog(@"PayPal Future Payment Authorization Canceled");
       [self dismissViewControllerAnimated:YES completion:nil];
}

- (void)sendFuturePaymentAuthorizationToServer:(NSDictionary *)authorization {
    // TODO: Send authorization to server
    NSLog(@"Here is your authorization:\n\n%@\n\nSend this to your server to complete future payment setup.", authorization);
    NSDictionary *temp =[authorization objectForKey:@"response"];
    NSString *authcode =[temp objectForKey:@"code"];
    metaid=[PayPalMobile clientMetadataID];

    NSDictionary *dict;
       // Send the authorization code, client metaid , id of the person paying and the person recieving payment and other required parameter
    [self serverHitForAuthentication:dict];
}

Step 4: :Save the refresh token received from the server.(In Utility file)

[Utility saveRefreshToken: refreshToken]

Step 5: If you have the refresh token and you again make any payment , there is no need to send the authorization code and no need to re enter the username and password again.

NSString *token = [Utility getRefreshToken];

    if(token.length >0)
        {
           // Send the client metaid and id of the person sending and recieving payment and any other required parameter in the dictionary.
           [self serverHitForAuthentication:dict];
        }