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#import "MyViewController.h" @implementation MyViewController // ... - (void)tappedMyPayButton { // Create and retain a `Braintree` instance with the client token self.braintree = [Braintree braintreeWithClientToken:self.clientToken]; // Create a BTDropInViewController BTDropInViewController *dropInViewController = [self.braintree dropInViewControllerWithDelegate:self]; // This is where you might want to customize your Drop in. (See below.) // The way you present your BTDropInViewController instance is up to you. // In this example, we wrap it in a new, modally presented navigation controller: dropInViewController.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemCancel target:self action:@selector(userDidCancelPayment)]; UINavigationController *navigationController = [[UINavigationController alloc] initWithRootViewController:dropInViewController]; [self presentViewController:navigationController animated:YES completion:nil]; } - (void)userDidCancelPayment { [self dismissViewControllerAnimated:YES completion:nil]; }