The Accounts resource allows you to work with accounts in a Xero organisation. The standard CRUD operations are supported, and you can also attach files to an account and even archive one.
The Bank Transactions resource allows you to work with bank transactions (receive or spend money transactions), overpayments, and prepayments. You can retrieve, create, and update bank transactions, among other things.
The Bank Transfers resource allows you to retrieve and create bank transfers. It also allows you to attach files to bank transfers, as well as retrieve its history and even add notes to it.
Branding themes determine the look of your invoices as well as the payment service offered to a customer. Among other services, you can add a payment service to a branding theme or retrieve the ones applied to it.
The Contact Groups resource allows you to work with contact groups and the individual contacts within them. You can retrieve, create, and update contact groups, as well as add a contact or remove one in a group.