IDTech iOS/OSX SDK Guide  1.1.052
API reference for BTPay 200
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Call the Singleton instance of the IDT_BTPay framework object:

A Singleton instance has been established in the IDT_BTPay class. To utilize the delegate protocols, best practices would be initialize the connection by setting the delegate with the singleton instance.

- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
[[IDT_BTPay sharedController] setDelegate:self];
}