Create REST APIs for WordPress website

There is an app, needs to create its REST APIs and connect with the existing WordPress admin panel dashboard.

2 user types:
1. Vet
2. Pet Owners

Login
Register
Dashboard (VET)
Dashboard Page 2 (VET)
Get Advice (VET)
Ask a Question (VET)
Advice Report Form (VET)
Advice Report (VET)
Treatment Form (VET)
Arrange a Video Conference (VET)
Video Conference (VET)
Checkout (VET)
Payment (VET)
Profile (VET)
Dashboard (PET OWNER)
Advice Report Form (PET OWNER)
Get Advice (PET OWNER)
Checkout Page (PET OWNER)
Payment (PET OWNER)
Video Conference (PET OWNER)
Profile (PET OWNER)