When Integrating two apps it's essential to add Digit Key and secret key. In swift there is a function to do this like :-
// Swift
Digits.sharedInstance().startWithConsumerKey("your_key", consumerSecret: "your_secret")
So I searched in the documentation to find the equivalent code for the android. But didn't find the code yet. So how can I ad iOS app Digits secret key and consumer key in my android app ?