Need rest APIs for mobile app in PHP (WordPress REST APIs experience must)

My budget is 7,000 INR max for these APIs and I need daily updates (Mon to Fri, weekend is addon), bid only if you are okay with this condition.

WordPress website is fully developed, I am developing a flutter mobile app and need APIs to save data from mobile app to WordPress Admin Panel via REST APIs.
Below are the screens for mobile app:

USER TYPE - COMMON
Splash Screen
Login Screen
Login Page
Register Screen

USER TYPE - VETERINARY DOCTOR
Dashboard (Basic info)
Dashboard Page 2 (Basic info)
Get Advice (VET)
Ask a Question (VET)
Advice Report Form (VET)
Advice Report (VET)
Treatment Form (VET)
Arrange a Video Conference (VET)
Video Conference (Only 2 page forms no extra integration for video/chat)
Profile (VET)

USER TYPE - PET OWNER
Dashboard (Basic info)
Advice Report Form
Get Advice
Checkout
Payment
Profile

Will share more details on chat.

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