Accessing Sandbox version of the function?

I was experimenting on wix-http-functions. It is an excellent way to connect with workflow system like IFTTT or Zapier.
http://prntscr.com/jgegwq
http://prntscr.com/jgegld

However, what I got is data inside the “Live” collection.
http://prntscr.com/jgeg71

My question: is there a way to access the sandbox version of the api? If not, then only the live API is available, then is there a way to write the data into the sandbox version of the collection. I want all my data to flow from sandbox to live (not the opposite). Data is normally checked by an admin to ensure correctness before pushing the data live.

Hey
Of course, you can read how here:

Or just post to this endpoint of your site.

Premium Sites:
https://{user_domain}/_functions-dev/

Free Sites:
https://{user_name}.wixsite.com/{site_name}/_functions-dev/