Android Only: Add Paypal Payment pages to an existing live app on Google play store

For Android app on Google Play. The app is already live. The code will be provided. Existing app is a market place to adopt, buy and sell pets The app can be downloaded here: [login to view URL] Top left button on the Main page needs to press and lead to a Payment Page Requirements of Payment Page: 1. 2 buttons: Button 1: Buy Banner Ad, Button 2: Buy Premium Shop Status 2. Buy banner Ad: Leads to form. Form fields (may add more later): A. Start Date of Display of Banner Ad (date can only be 2 weeks from now at the minimum), B. Number of Days to display Ad, C. Upload Banner Ad picture (*.jpg or *.png, rectangle shape) D. Auto-calculate and display cost at USD 25 per day. E. Pay and Submit for Approval button - will lead to Paypal link for USD 100 to be paid 3. Buy Premium shop status button. Request user to login if not logged in. Brief Description (i will provide) at the top of the form. Form Fields: A. Select 3 months at USD 100, or 1 year at USD 350. B. Auto-calculate and display cost at USD 25 per day. C. Pay and Submit for Approval button - will lead to Paypal link for USD 100 to be paid 4. New column to add to existing database of Users: PremiumUser (yes/no), DateofPremiumExpiry (date), and any other fields related to the payment buttons 5. Add new column and functionality to existing database of pet listings, so that PremiumUsers always have a "highlighted" listing and a logo "Premium Listing" on their posted pet listing, and will always appear at the top. 6. Add "Premium user icon" on User Account page for those users which have user accounts. Important: Please make sure that you have seen the Profile pages and Registration pages on the actual app before you actually attempt to ask me any questions on the project. When asking me any questions, I will respond with, "Have you actually seen the Profile page and Registration page on the actual app?" Payment Terms 1. All milestones are only released after the app is fully complete, app is uploaded to the App store. Feedback will be written after programming files are sent over 2. Only an initial milestone of 10% of project value is created at the beginning. This milestone is only released after the first draft is sent over