The Accounts API lets you retrieve account and transaction data for Citi Customers who have authorized your app. In most cases, you'll want to request a summary of all accounts first, which will return basic account information and account IDs. Once you have this information, you can request additional account details and/or transactions.
The API can return information for cards, checking and savings accounts. We are working hard to extend this API to return other types of accounts like brokerage, mortgages and loans. Stay tuned for more!