However, invoices are sent by sellers to indicate payments owed, whereas buyers send purchase orders to initiate a purchase. Since purchase orders list goods or services along with pricing and shipping information, they often resemble invoices. Getting started with the Smartsheet API.ENGAGE Smartsheet ENGAGE brings together our global customers, experts, and partners to share their experiences, ideas, and best practices.Smartsheet events Your hub for Smartsheet events, webinars, Q&As, and user groups.Partners Learn about the Smartsheet partner program and access our partner directory.Community Explore user-generated content and stay updated on our latest product features.Help and Learning A comprehensive knowledge base, including articles, tutorials, videos, and other resources that cover a range of topics related to using Smartsheet.Content Center Articles and guides about project management, collaboration, automation, and other topics to help you make the most of the Smartsheet platform.