InAppPurchaseManager

InAppManager.swift for InApp purchase to manage transactions in application.

Just call method

call loadInAppData to load inapp data

func loadInAppData() {
    InAppManager.shared.delegate = self
    InAppManager.shared.requestProductInfo()
}

call startPurchasing to start transaction

//2) Second
func startPurchasing() {
    InAppManager.shared.triggerEvents()
}