Need to have transaction id from pay key PayPal - ios

Question

I have successfully integrated PayPal into my iOS application using PayPal MPL library.
But the problem is how to get the transaction id from paykey which i get from callback method of PayPal.
i have tried this way but getting error of invalid request.
- (void)paymentSuccessWithKey:(NSString *)payKey andStatus:(PayPalPaymentStatus)paymentStatus
{
NSURL *url = [NSURL URLWithString:[NSString stringWithFormat:#"https://svcs.paypal.com/AdaptivePayments/PaymentDetails"]];
//NSURL *url = [NSURL URLWithString:[NSString stringWithFormat:#"https://svcs.sandbox.paypal.com/AdaptivePayments/PaymentDetails"]];
NSMutableURLRequest *theRequest=[NSMutableURLRequest requestWithURL:url];
NSString *parameterString = [NSString stringWithFormat:#"payKey=%#&requestEnvelope.errorLanguage=%#",payKey,#"en_US"];
NSString *msgLength = [NSString stringWithFormat:#"%d", [parameterString length]];
[theRequest addValue: msgLength forHTTPHeaderField:#"Content-Length"];
//do post request for parameter passing
[theRequest setHTTPMethod:#"POST"];
[theRequest setValue:#"application/x-www-form-urlencoded" forHTTPHeaderField:#"Content-Type"];
//passing key as a http header request
[theRequest addValue:api_username forHTTPHeaderField:#"X-PAYPAL-SECURITY-USERID"];
//passing key as a http header request
[theRequest addValue:api_password forHTTPHeaderField:#"X-PAYPAL-SECURITY-PASSWORD"];
[theRequest addValue:api_signature forHTTPHeaderField:#"X-PAYPAL-SECURITY-SIGNATURE"];
[theRequest addValue:#"JSON" forHTTPHeaderField:#"X-PAYPAL-REQUEST-DATA-FORMAT"];
[theRequest addValue:#"JSON" forHTTPHeaderField:#"X-PAYPAL-RESPONSE-DATA-FORMAT"];
[theRequest addValue:app_id forHTTPHeaderField:#"X-PAYPAL-APPLICATION-ID"];
[theRequest setHTTPBody: [parameterString dataUsingEncoding:NSUTF8StringEncoding]];
NSURLResponse *response;
NSError *err;
NSData *responseData = [NSURLConnection sendSynchronousRequest:theRequest returningResponse:&response error:&err];
NSString* s = [[NSString alloc] initWithData:responseData encoding:NSUTF8StringEncoding];
NSDictionary *result = [s JSONValue] ;
}
i need to save the transaction id on the backend of my application for future references.
Need to know how to get it asap.
Any help would be appreciated.
Thanks & Regards
Pankaj

Answer 1

I dont know about iOS but for andorid , we implement PayPalResultDelegate , Serializable interface , in a class like . i am sharing my code :
class ResultDelegate implements PayPalResultDelegate, Serializable
{
private static final long serialVersionUID = 10001L;
PaypalDetailImplementation ob = new PaypalDetailImplementation() ;
public void onPaymentSucceeded(String payKey, String paymentStatus)
{
ob.resultTitle = "SUCCESS";
ob.resultInfo = "You have successfully completed your transaction.";
ob.resultExtra = "Key: " + payKey;
this.displayInformation("onPaymentSucceeded", ob.resultTitle, ob.resultInfo, ob.resultExtra) ;
}
public void onPaymentFailed(String paymentStatus, String correlationID,String payKey, String errorID, String errorMessage)
{
ob.resultTitle = "FAILURE";
ob.resultInfo = errorMessage;
ob.resultExtra = "Error ID: " + errorID + "\nCorrelation ID: "+ correlationID + "\nPay Key: " + payKey;
this.displayInformation("onPaymentFailed", ob.resultTitle, ob.resultInfo, ob.resultExtra) ;
}
public void onPaymentCanceled(String paymentStatus)
{
ob.resultTitle = "CANCELED";
ob.resultInfo = "The transaction has been cancelled.";
ob.resultExtra = "";
this.displayInformation("onPaymentCanceled", ob.resultTitle, ob.resultInfo, ob.resultExtra) ;
}
public void displayInformation ( String msg , String resultTitle , String resultInfo , String resultExtra )
{
Log.i("Result as message : ",msg);
Log.i(resultTitle,"tushar:onPaymentSucceeded");
Log.i(resultInfo,"tushar:onPaymentSucceeded");
Log.i(resultExtra,"tushar:onPaymentSucceeded");
}

Answer 2

First, it's critically important to make sure that you don't ship an app with the API password & signature. Otherwise a malicious user could disassemble your app, recover the credentials and perform arbitrary operations to your account. Read more about verifying a payment.
But, assuming that you implemented similar code on your server, it should work. What is the exact error that you're getting?

Answer 3

I got this problem solved my self.
I was making the X-PAYPAL-REQUEST-DATA-FORMAT of JSON type but when i changed it to NV i start edgetting transaction id.
Thanks to all for their answers.