I work on a php application to track abandoned carts and further !
1) Is that request returns only abandoned carts ? GET /admin/api/2021-04/checkouts.json
2) What request(s) I have to use to track that if the customer completed the abandoned cart.
My scenario like this; first get the abandoned carts, then get the successful transactions or orders or payments list (I don't know) to compare the abandoned cart list in it. Eventually tracking the abandoned carts, then it ended by cancel, payment, forever abandoned.