Are you actually using Wix Answers?!
https://help.wixanswers.com/en/
As for exposing your site then see Wix Fetch and Wix HTTP Functions.
https://www.wix.com/corvid/reference/wix-fetch.html#fetch
https://support.wix.com/en/article/corvid-accessing-third-party-services-with-the-fetch-api
https://www.wix.com/corvid/reference/wix-http-functions.html
https://support.wix.com/en/article/corvid-exposing-a-site-api-with-http-functions
For hoos see here.
https://www.wix.com/corvid/reference/wix-data.Hooks.html
https://support.wix.com/en/article/corvid-about-data-hooks
https://support.wix.com/en/article/corvid-using-data-hooks