I have a store created in Shopify, and when a user completes an order from the store, I need to send out an API request to a 3rd party API that are client is going to create. Could some one please provide some information on how to get started with this?
Your best reference is Shopify API docs so you can work out what data points you want to be using: https://shopify.dev/api
You you also need to integrate with the second API and map data between the systems.
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