The HubSpot Line Item API allows you to link products, along with specific information about the sale of a product, to your HubSpot deals. It represents a line in an order, with details that includes; product, quantity, and price for each line of an order. This API is part of the HubSpot developer preview program that is considered unstable and subject to bugs or changes while under development. Line items is a CRM objects that support custom properties and is managed through the CRM Object Properties API. HubSpot provides products for marketing, sales and CRM. It is inbound marketing and sales software to attract visitors, convert leads, and close sales.