Is it possible to add a variant to a cart (using cart ID?) through a custom app? Or does this have to be done with the AJAX api through the theme?
I'm trying to develop a middleware that receives webhooks when a cart is created, and automatically adds a warranty variant to the cart. There's a lot of conflicting information regarding what's possible on this. Thanks!
Use scripttags to add the item to the cart using the fronted ajax api
To create a custom order with specific items on the backend use draft orders.
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