I need a Flutter developer for some quick project modification

I need a Flutter developer for some quick project modifications on a script I bought from codecanyon.net. 1. I need the product layout on the homepage changed, 2. I need to add two more pages for articles (article home page and article page), 2. Connect all apps (user app, admin app, and delivery app) to firebase and finally 3. change the payment from strip to paystack.

The link to the script https://codecanyon.net/item/flutter-grocery-full-android-ios-ecommerce-app/30552472

Attached is the image of the page I want to be added to the store.