Overview of the Accounts common model.

An `Account` represents a category in a company’s ledger in which a financial transaction is recorded against. The aggregation of each `Account` object is often referred to as the **Chart of Accounts**. An `Account` can be classified into one of the following categories, determined through the `classification` field: * __Asset:__ Accounts Receivable and Bank Accounts * __Liability:__ Accounts Payable and Credit Card Accounts * __Equity:__ Treasury Accounts and Retained Earnings * __Revenue:__ Income and Other Income * __Expense:__ Cost of Goods Sold and Office Expenses