Open Credits in your account (or go straight there from the credits line in the avatar menu).
The tag on the balance card tells you which wallet this is (see the team wallet below), and the Credit store button next to it is where you top up (see 14.4). The table under it holds one entry per row:
- Time
- Item — what was done (Video / Image / Speech…), with the sum in small text underneath, like seedance 720P × 5s. That line is the answer to "why did this one cost so much". Rows that aren't generations name their reason instead: Top-up, Refund, Subscription credits granted, Subscription credits lapsed.
- Change — a negative number is a charge, a positive one is money in (shown in green).
The history really does page back: there is a pager under the table, 20 / 50 / 100 rows a page, so you can keep going when you reconcile.
Once you have topped up, this page also carries a Top-up orders table (time, credits paid + free, amount, status). It is not the same thing as the history: the history records what moved in the wallet, the orders record that you bought something — unpaid and cancelled orders never show up in the history at all. Each paid row has an Invoice action (CNY orders only); fill in the title and email, submit, and the invoice is sent to that email once processed.