Hi @thienhoang.tran ,
When a customer has multiple Magento Stores and have specified which one(s) they want to sync as part of their integration, the historical sync appears to ignore this and the API retrieves every order (which later get dropped).
From our tests, the periodic sync and the targeted syncs both are correct and specify the store code in the REST API call; It's just the historical sync that is not.
This results in the historical sync making a huge volume of unnecessary requests, and with customers who have multiple magento stores integrated, then it results in lots of duplicate requests and strain on their server.
Our team is aware of this issue and is working to get a fix out as soon as we can. Thank you for your patience and understanding during the time.
Have a good day!
Alex