What it does
On 已买到的宝贝 it reads the order cards you can already see: order ID, shop, item, amount paid, status, and the waybill when Taobao shows it. You clip one order or the whole page, then open the ledger beside the tab.
Data never leaves this browser. There is no account and no upload.
Privacy
Chrome Web Store listings need a public policy even when storage is local. The full text is here:
Install
Until it is on the Chrome Web Store, load the unpacked folder in chrome://extensions with Developer mode on. After install, refresh the Taobao tab.