Flutter App: Payments, DB connect, AppStore/PlayStore Deploy

I am looking for a freelancer to help me finish my Flutter App. I have management and coding experience so you can expect professional level communication from me. See my reviews.

What is already done:
- App design is finished.
- Database and content structure is finished and created in firebase.
- Account creation, google and facebook authentication tested.

What needs to be done:
- The content of the app is the product, the app will have both paid and unpaid content. Need to create firebase functions to retrieve only firebase content that the user has purchased. (I have attached my doccument displaying how the content structure is, I have already created firebase fields that reflect this with links to the child doccuments etc.)
- Stripe should be connected for in-app payments. And ofcourse payments should be noted on the user's account.
- The firebase content has fields for 3 different languages, there is a language switcher in the app design settings. This needs to be connected.
- I might want to make some small visual changes once things are connected, I can most liekly do that myself, but I am not strong in dart so sometimes I will message with a question if I am stuck.
- Once these things are finished I will need some support with submitting to AppSport and PlayStore approval.