Paypal IOS SDK issues (can't communicate with servers) - ios

Question

I am trying to process a paypal payment using the latest IOS SDK 2 - BASICALLY i'm trying to follow the example at -
https://github.com/paypal/PayPal-iOS-SDK/blob/master/docs/single_payment.md
without much luck.
Background
I'm in Australia.
I'm using the paypal sdk to take a payment in IOS app. the app then makes a call to a PHP web server that will validate the paypal payment and then update a subscription on the PHP server backend.
What I've done and where I'm getting stuck.
I've setup a classic API application.
I've set the production and sandbox environments using -
[PayPalMobile initializeWithClientIdsForEnvironments:
#{PayPalEnvironmentProduction : #"HIDDEN",
PayPalEnvironmentSandbox : #"HIDDEN"}
];
With the text HIDDEN replaced with the real ones.
I used the following code, that successfully starts the paypal dialog -
[PayPalMobile preconnectWithEnvironment:PayPalEnvironmentSandbox];
PayPalPayment *payment = [[PayPalPayment alloc] init];
NSDecimalNumber *total_cost = NSDecimalNumber decimalNumberWithString:#"4.30"];
// Amount, currency, and description
payment.amount = total_cost;
payment.currencyCode = #"USD";
payment.shortDescription = #"test";
// Use the intent property to indicate that this is a "sale" payment,
// meaning combined Authorization + Capture. To perform Authorization only,
// and defer Capture to your server, use PayPalPaymentIntentAuthorize.
payment.intent = PayPalPaymentIntentSale;
// Check whether payment is processable.
if (!payment.processable) {
[self display_message: #"Payment could not be processed. This can happen for a variety of reasons, i.e. the payment amount was negative, etc. Please contact us if you believe you have received this message in error."];
return;
}
// Create a PayPalPaymentViewController.
PayPalPaymentViewController *paymentViewController;
paymentViewController = [[PayPalPaymentViewController alloc] initWithPayment:payment
configuration:self.payPalConfiguration
delegate:self];
// Present the PayPalPaymentViewController.
[self presentViewController:paymentViewController animated:YES completion:nil];
The paypal dialog appears but then displays a "can't communicate with servers error, try again later".
the following appears on the xcode console -
2014-03-25 10:42:22.432 PayPal SDK: Request has failed with error:
pp_service_error_json_parse_error - System error. Please try again later. (500) | PayPal Debug-ID: a26da2c300c31 | Details: (
{
"ns_error" = "Error Domain=NSCocoaErrorDomain Code=3840 \"The operation couldn\U2019t be completed. (Cocoa error 3840.)\" (No value.) UserInfo=0xbadecd0 {NSDebugDescription=No value.}";
}
).
so QUESTION (1) any ideas why this is happening.
and QUESTION (2) after this works and I can make a payment, do I then need to confirm the payment info returned from paypal? i.e. do I -
Extract the payment id from the SDK callback.
Create a rest app id in paypal in addition to the classic one, and
then get an auth token via a rest call to payal. without the rest
app, i don't seem to have the secret key, etc to access the paypal
rest service.
Then use the auth token and id from (1) to make another rest call
to get the payal payment info and validate it (i.e. check the amount
is whats expected etc)?
Hope that makes sense.
PS I find the docs incredibly confusing.
EDIT: Ok, so next day without anything changed, i tried running the app again, this time different xcode console error - "invalid client credentials". nowhere in this example at https://github.com/paypal/PayPal-iOS-SDK/blob/master/docs/single_payment.md does it specify client credentials except for this part around client ids -
[PayPalMobile initializeWithClientIdsForEnvironments:
#{PayPalEnvironmentProduction : #"HIDDEN",
PayPalEnvironmentSandbox : #"HIDDEN"}
];
which i've set correctly. are their additional credentials that need to be set before launching paypal ios sdk ui?