Invoice

Definition

In the Invoicing API, an invoice is a document that records a commercial transaction between a seller and a buyer. It states what was sold, the quantities, the prices, the applicable taxes, and the total amount due.

“Invoice” also exists in the Accounting API (an entry that generates journal entries automatically) and the PMS API (a guest bill).

Purpose

Invoices drive the billing and collection cycle. They serve as the legal record of a sale or purchase.

Relationships

• Each invoice belongs to a contact (customer or supplier).
• Each invoice line references a product and a tax rate.

Endpoints

Read

Method	Endpoint	Description
GET	Retrieve all invoices	Returns a list of all invoices
GET	Retrieve one invoice	Returns a single invoice by ID

Write

Method	Endpoint	Description
POST	Create an invoice	Creates a new invoice
POST	Upload a document (PDF)	Upload a PDF document linked to an invoice

See also

• Contacts
• Products
• Taxes