An open-source SDK for integrating in-app purchases on Android

// Your app's code
Adapty.makePurchase(activity, product) { result ->
    when (result) {
        is AdaptyResult.Success -> {
            val profile = result.value
            // NOTE: profile is null in case of cross-grade with DEFERRED proration mode
            // successful purchase
        }
        is AdaptyResult.Error -> {
            val error = result.error
            // handle the error
        }
    }
}

// Your app's code
Adapty.restorePurchases { result ->
    when (result) {
        is AdaptyResult.Success -> {
            val profile = result.value
            // check the access level
        }
        is AdaptyResult.Error -> {
            val error = result.error
            // handle the error
        }
    }
}

// Your app's code
Adapty.identify("YOUR_USER_ID") { error ->
    if (error == null) {
        // successful identify
    }
}

// Your app's code
val builder = AdaptyProfileParameters.Builder()
    .with("Profile_Parameters")

Adapty.updateProfile(builder.build()) { error ->
    if (error != null) {
        // handle the error
    }
}

// Your app's code
func onAttributionCallback(_ data: [AnyHashable : Any]) {
    Adapty.updateAttribution(data, source: .custom)
}
// The method of getting attribution varies for each particular attribution system