# gorgias-developers Documentation > Gorgias Developer Portal. REST API reference and Guides. This file lists one part of the documentation. The full index is at https://developers.gorgias.com/llms.txt. ## Quickstart: Authentication - [OAuth2 Scopes](https://developers.gorgias.com/docs/oauth2-scopes.md): OAuth2 scopes allow to limit your app's access to Gorgias user’s account data. ## Quickstart: Building a Public App - [Overview](https://developers.gorgias.com/docs/overview.md) - [Building a high-quality Gorgias app](https://developers.gorgias.com/docs/building-a-high-quality-gorgias-app.md) - [1. Register on Developer Portal & Get Gorgias Sandbox Account](https://developers.gorgias.com/docs/1-register-on-developer-portal.md) - [5. Submit app for review](https://developers.gorgias.com/docs/5-submit-app-for-review.md) ## Quickstart: Tutorials - [OAuth2 authentication for creating apps with Gorgias](https://developers.gorgias.com/docs/oauth2-authentication-for-creating-apps-with-gorgias.md) - [Create a ticket using API](https://developers.gorgias.com/docs/create-a-ticket-using-api.md) - [Create a new message in ticket via API](https://developers.gorgias.com/docs/create-a-new-message-in-ticket-via-api.md) - [Create integrations and widgets](https://developers.gorgias.com/docs/create-integrations-and-widgets-programmatically.md) - [Refresh Shopify Cart’s UI on Updates via Convert](https://developers.gorgias.com/docs/how-to-attach-gorgias-tracking-data-to-shopify-cart-and-checkout-attributes-copy.md)