# Letterby API

## Docs

- [Create Action](https://docs.letterby.com/api-reference/endpoint/action-create.md): Creates a new action
- [Delete Action](https://docs.letterby.com/api-reference/endpoint/action-delete.md): Deletes an action by ID
- [Retrieve Action](https://docs.letterby.com/api-reference/endpoint/action-retrieve.md): Retrieves an action by ID
- [Update Action](https://docs.letterby.com/api-reference/endpoint/action-update.md): Updates an action by ID
- [List Actions](https://docs.letterby.com/api-reference/endpoint/actions-list.md): Returns actions from the system that the user has access to
- [Create Audience](https://docs.letterby.com/api-reference/endpoint/audience-create.md): Creates a new audience
- [Delete Audience](https://docs.letterby.com/api-reference/endpoint/audience-delete.md): Deletes an audience by ID
- [Retrieve Audience](https://docs.letterby.com/api-reference/endpoint/audience-retrieve.md): Retrieves an audience by ID
- [Update Audience](https://docs.letterby.com/api-reference/endpoint/audience-update.md): Updates an audience by ID
- [List Audiences](https://docs.letterby.com/api-reference/endpoint/audiences-list.md): Returns audiences from the system that the user has access to
- [Create Contact](https://docs.letterby.com/api-reference/endpoint/contact-create.md): Creates a new contact
- [Delete Contact](https://docs.letterby.com/api-reference/endpoint/contact-delete.md): Deletes a contact by ID
- [Retrieve Contact](https://docs.letterby.com/api-reference/endpoint/contact-retrieve.md): Retrieves a contact by ID
- [Update Contact](https://docs.letterby.com/api-reference/endpoint/contact-update.md): Updates a contact by ID
- [List Contacts](https://docs.letterby.com/api-reference/endpoint/contacts-list.md): Returns contacts from the system that the user has access to
- [Create List](https://docs.letterby.com/api-reference/endpoint/list-create.md): Creates a new list
- [Delete List](https://docs.letterby.com/api-reference/endpoint/list-delete.md): Deletes a list by ID
- [Retrieve List](https://docs.letterby.com/api-reference/endpoint/list-retrieve.md): Retrieves a list by ID
- [List All Lists](https://docs.letterby.com/api-reference/endpoint/lists-list.md): Returns lists from the system that the user has access to
- [Introduction](https://docs.letterby.com/api-reference/introduction.md): Welcome to the Letterby API documentation
- [Code Blocks](https://docs.letterby.com/essentials/code.md): Display inline code and code blocks
- [Audiences & Segmentation](https://docs.letterby.com/guides/audiences-and-segmentation.md): Complete guide to creating and managing audience segments for targeted campaigns and advanced contact filtering.
- [Authentication & API Keys](https://docs.letterby.com/guides/authentication.md): Complete guide to Letterby API authentication, key types, and security best practices
- [Custom Integration](https://docs.letterby.com/guides/implementing-letterby.md): Complete guide to integrating Letterby into your system with point rewards and waitlist management.
- [Getting started with Letterby](https://docs.letterby.com/guides/introduction.md): Build engaging waitlists that convert users and grow your audience before launch
- [Building referrals and rewards](https://docs.letterby.com/guides/referrals-and-rewards.md): Learn how to implement viral referral systems and reward mechanisms that drive engagement and growth

## OpenAPI Specs

- [openapi](https://docs.letterby.com/api-reference/openapi.json)

## Optional

- [Documentation](https://docs.letterby.com)
- [Updates](https://letterby.com/updates)