# postpress

> Postpress is a unified messaging API that lets developers integrate the LinkedIn API, the WhatsApp API, the Instagram API, Gmail, Messenger, Telegram and X into their own apps and AI agents without applying for each platform separately. Connect an account once, get a single key, and use the same REST endpoint to send messages, fetch chats, manage contacts and receive webhook events across every channel. No per-platform SDKs, no scraping, no maintenance.

postpress is a developer API for social messaging. One authentication flow, one message object, and one webhook stream covering LinkedIn, WhatsApp, Telegram, Instagram, Messenger, X (Twitter), Gmail, Outlook, and IMAP. Built for SaaS products that need to send, receive, and act on messages across networks without maintaining a separate scraper or OAuth flow per provider.

## Getting started

- [Introduction](https://www.postpress.io/docs/introduction): What postpress is, the supported providers, and the shape of the API.
- [API usage / Quickstart](https://www.postpress.io/docs/quickstart): Get an API key, link a first account, and send your first message.
- [Provider features](https://www.postpress.io/docs/provider-features): Capability matrix across LinkedIn, WhatsApp, Telegram, Instagram, Messenger, X, and email providers.
- [Provider limits](https://www.postpress.io/docs/provider-limits): Sync limits, rate limits, and known restrictions per provider.

## Account connection

- [Connection methods](https://www.postpress.io/docs/connection-methods): Native vs hosted authentication, when to use each.
- [Hosted auth wizard](https://www.postpress.io/docs/hosted-auth-wizard): Single-use link flow so end-users connect their own accounts without you handling credentials.
- [Custom authentication](https://www.postpress.io/docs/custom-authentication): Programmatic credential / cookie / OAuth account linking with checkpoint (2FA) handling.
- [LinkedIn guide](https://www.postpress.io/docs/provider-linkedin): LinkedIn-specific connection, restrictions, and headless session behavior.
- [WhatsApp guide](https://www.postpress.io/docs/provider-whatsapp): WhatsApp account linking and per-account constraints.
- [Google OAuth](https://www.postpress.io/docs/google-oauth): Connecting Gmail and Google Calendar via OAuth.
- [Microsoft OAuth](https://www.postpress.io/docs/microsoft-oauth): Connecting Outlook / Microsoft 365 mail and calendar via OAuth.

## Messaging

- [Message object](https://www.postpress.io/docs/message-object): The unified message schema across all providers.
- [Send messages](https://www.postpress.io/docs/send-messages): Send a message, including attachments and provider-specific fields.
- [Retrieving messages](https://www.postpress.io/docs/retrieving-messages): List chats, fetch thread history, pagination model.
- [Users overview](https://www.postpress.io/docs/users-overview-docs): The messaging user model (attendees, profiles, contacts).
- [Invite users](https://www.postpress.io/docs/invite-users): Send connection / friend invitations on supported providers.

## Webhooks

- [Webhooks overview](https://www.postpress.io/docs/webhooks-overview): Subscribe to events, verify signatures, replay model.
- [New messages](https://www.postpress.io/docs/new-messages-webhook): Real-time delivery of inbound chat messages.
- [New email](https://www.postpress.io/docs/new-email-webhook): Real-time delivery of inbound emails.
- [Account status updates](https://www.postpress.io/docs/account-status-updates): Connection state changes, restrictions, and reauth prompts.
- [Tracking email](https://www.postpress.io/docs/tracking-email-webhook): Open and click tracking events for sent emails.
- [New relation](https://www.postpress.io/docs/new-relation-webhook): Fires when a new connection / contact is added.
- [Calendar webhook](https://www.postpress.io/docs/calendar-webhook): Calendar event create / update / delete notifications.

## Email & calendars

- [Email & calendars overview](https://www.postpress.io/docs/emails-calendars-overview): How postpress models mail and calendars on top of Google and Microsoft.
- [Email object](https://www.postpress.io/docs/email-object): Unified email schema.
- [Send email](https://www.postpress.io/docs/send-email): Send mail through a linked Gmail / Outlook / IMAP account.
- [Retrieving emails](https://www.postpress.io/docs/retrieving-emails): Folder traversal, filters, pagination.
- [Calendars & events](https://www.postpress.io/docs/calendars-events): Read and write calendar events.

## LinkedIn cookbooks

- [Create an outreach sequence](https://www.postpress.io/docs/linkedin-outreach-sequence): End-to-end pattern for connection request, follow-up, and reply handling.
- [Detect accepted invitations](https://www.postpress.io/docs/linkedin-accepted-invitations): Webhook + polling pattern to detect when a sent invite is accepted.
- [LinkedIn API search](https://www.postpress.io/docs/linkedin-api-search): Run a LinkedIn / Sales Navigator search via the API and export results.
- [Posts and comments](https://www.postpress.io/docs/linkedin-posts-comments): Read posts and comments, post on behalf of a linked account.
- [Get raw data route](https://www.postpress.io/docs/linkedin-raw-data-route): Escape hatch for fields not yet surfaced in the unified API.

## Company

- [Contact](https://www.postpress.io/contact): Sales and support contact.
- [Privacy policy](https://www.postpress.io/privacy): How postpress handles data.
- [Terms of service](https://www.postpress.io/terms): Acceptable use and commercial terms.
- [Cookies](https://www.postpress.io/cookies): Cookie policy.

## Optional

- [Sitemap](https://www.postpress.io/sitemap.xml): Full machine-readable URL list for crawlers.