Android Flower Selling App Development

I'm looking to develop a comprehensive Flower Selling Android app, complete with an Admin app for managing articles, pricing, and deliveries. The app should include:

- Product catalog and search
- Secure payment gateway
- Order tracking
- User authentication (both login/register and guest checkout options)
- Delivery options, including same-day delivery

Ideal skills and experience include:
- Experience in developing Android applications
- Strong background in secure payment integration
- Familiarity with order tracking systems
- Knowledge in implementing user authentication
- Delivery management system expertise

Please provide examples of similar projects and your approach to this development.