Amazon (SP-API)
Amazon orders and settlements, with the fees pulled apart.
Amazon does not pay you per order. It pays a settlement every two weeks that nets orders against referral fees, fulfilment fees, storage, returns and adjustments. Sellers routinely read the deposit as revenue, which overstates the top line and hides the real margin.
Both sides come across: the orders, and the settlement that pays for them. What Amazon kept is visible as its own number rather than buried in a net figure.

How to connect it
You need Seller Central access for the account.
Amazon confirms the permission on its own screen.
A seller active in several countries connects each one, because each settles separately.
What arrives, and when
Orders and settlement reports.
Questions people actually ask
Because it never does. The settlement is sales minus fees minus returns. Both figures are shown, and the gap between them is the fee load.