Removal of testing code for ads repository.
Error handling for custom ad image loading.
Unique user engagement when clicked on 8 modules on Home1Fragment and Home2Fragment
Worked on getting callbacks for url change in PaymentActivity.
Integrated sub-category api and its ui with tablyout
Integrated product listing api and cached data in ShopViewModel for every super-category, category and sub-category.
Created ProductFragment to showcase product details: Added viewpager and its adapter to show all images of a product in a sliding manner.
