I have a very simple requirement. Upon completion of an order, if a customer has a given tag, I want to also append that tag to an order. (i.e. customer has a "specialdude" tag, add "specialdude" tag to the order).
I'm a developer. How would I go about this? Can I do this through these theme (ideally in the same way I auto append tags to Customer during account registration)?
I know there is an app for this, but I really don't want to shell out $15/m for something (what should be) rather straightforward.
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This is an accepted solution.
You can create private app for this - listen to appropriate webhook https://help.shopify.com/en/api/reference/events/webhook and modify your order 👀
As @Yurіі said you have to create private app then you can add tag in order by Order_create webhook.
You have to set callback url in order_create webhook and get customer tag in response so you can add this tag in order by "order update" API