Android activity to offer In-App Subscriptions

Hi! I need an android activity that enable users to buy In-App Subscriptions from Google Play. This activity will be integrated with an existent Android App. The user will have 3 different premium subscriptions options (1 month, 3 months, 6 months). I already have an iOS app with that functionality. We will provide you a screenshot and a video to show how this screen works in iOS. The android version should follow the iOS layout. Requirements: I) An Android Studio Project with minSdkVersion: 16 and targetSdkVersion: 22. II) A simple activity with a button that start the PurchaseActivity. III) Project configured to use Google Play In-app Billing to buy subscriptions. IV) A separated file with the subscriptions constants ids (Subscription ID) to be replaced with the real ones. V) Save the purchase result locally (SharedPreferences). You can use the key 'userId_subscriptionId', where userId is a String variable and productId is the product the user bought. VI) Notify the purchase result (success or error) with a event. You may use EventBus, or a better solution. I will use the event later to provide the subscription benefits to the user. VII) Carousel slider to show the benefits of buy a subscription. You may use ViewPager. VIII) Animate the background gradient (2 different colors) when the carousel move to the next item. IX) Each item in the ViewPager have a Title, Subtitle and a Lottie Animation ([login to view URL]). We will provide the Lottie files. We will sent you a video to show how the switch between pages works. X) When the user clicks on the close button, a 7 days trial subscription will be offered to the user. This dialog have two actions, "Test now" and "Maybe later". If the user select Test now, start the In-app Subscription purchase flow to "buy" the Free Trial Google Play In-app Subscription. Additional information will be sent to the selected Freelancer. Thanks!