API on Wix

Hello to all,
My name is Alexandre and I work for a clothing shop. I have a small problem: we have a Wix site and recently we switched to a cash register software called Hiboutik.
The problem is that the connection between Wix, our website, and Hiboutik, our checkout software, is not made. I know that we need to connect the Hiboutik API to Wix but I have no idea how to do it. Connecting the API would allow that when an item is sold on Wix, this same item is withdrawn on our Hiboutik stock and vice versa.
I don’t know how to make code and I would like to know if someone knows how to integrate the API to Wix with the right line of code and also where to put this line of code

Thank you in advance to the person who could help me
Alexandre

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