Send order info to external API

Hi there, I know this question has been asked quite a few times in various ways, but I can’t seem to find a definitive answer to it as it seems a little confusing.

We have an external API written in Javascript running in Google Cloud API. It processes orders based on data it receives from multiple different stores (Shopify, Squarespace etc.).

We want to also receive orders from Wix stores (only 4) and process them via our API. My question is, do we need to create an entire “app” (available in the marketplace) just for this, or can we use the following event trigger to send data via webhook to our API?

exportfunction wixStores_onNewOrder(event)

Thank you very much for your time!

You could use the fetch API to POST a message to the external API.