Fix nullability

parent aa0cf547
......@@ -80,7 +80,7 @@ extern NSString *const BUYPaymentProviderDidCompleteCheckoutNotificationKey;
* @param provider the `BUYPaymentProvider`
* @param error the optional `NSError`
*/
- (void)paymentProvider:(id <BUYPaymentProvider>)provider didFailWithError:(NSError *)error;
- (void)paymentProvider:(id <BUYPaymentProvider>)provider didFailWithError:(nullable NSError *)error;
/**
* Called when the checkout has completed
......
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