This document provides an overview of e-invoicing in Turkey. It discusses the background and obligations for e-invoicing, how paper invoices differ from e-invoices, and the requirements for sending and receiving e-invoices through the GIB/TRA portal. It also outlines the integration methods for connecting an organization's systems to the GIB/TRA portal, either through manual entry on the portal website, direct integration between systems, or working with an integrator. The presentation aims to explain e-invoicing standards and compliance requirements for companies in Turkey.