magento 2, API errors mainly

There are some needs for complementing the APIs in our Magento 2 site


Screen H1C
Bestseller logic is not delivering bestsellers
Logic
1. deliver sold bestsellers
2. if no bestsellers then deliver best reviews
3. if no reviews, deliver random 10 products

Screen C2
Products are not coming through.
Test and see what is going wrong

Screen M9
Send to user profile:
1. customer_skincolour
2. customer_eyecolour
3. customer_haircolour
4. customer_lipcolour
5. customer_skinundertone

Screen M16
send to user profile
12 face subareas and products

Screen T1 and T2
Send historical data for colour scans, 10 max

Payment module, STRIPE/Webkul
is crashing the site when made active

Login, Payment, Address, Etc is not accessible
Error:
{"message":"The product's required option(s) weren't entered. Make sure the options are entered and try again."}


Your skills:
- Magento 1/2
- PHP
- 10+ years