Support & Ticketing · Integration

Missive

Add Missive to your product for your customers, and give your AI agents governed access to it.

Missive is a shared inbox built around team collaboration, and its distinctive object is the post: an internal comment that lives inside the same conversation as the customer-facing email or chat. That is the thing integrations should target, because writing a post adds context without emailing anyone, which is exactly what a product wants when it has something to contribute rather than something to send. Conversations span channels, so email, SMS and chat with the same person are one thread. Shared labels are how teams organise, and they are per-organisation configuration rather than a fixed set. fastn scopes each customer's token to their own organisation.

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In your product

Embedded for your customers. Per-tenant auth, no per-customer code, maintained by fastn.

Let a customer connect their own Missive organisation so team inbox conversations appear inside your product.

Add a post to a conversation, giving the team context without sending anything to the customer.

Read conversations across email, chat and SMS as one thread per person.

React when a conversation is assigned or labelled, rather than polling a shared inbox.

For your AI agents

Governed, audited access for the agents you build, through the MCP server.

An agent posts a summary into a conversation for the team, without emailing the customer.

An agent applies a shared label within governed permissions, with the write audited per tenant.

An agent reads a cross-channel thread before suggesting who should handle it.

Example prompt

Which conversations are unassigned, and what is each one about?

Set up Missive in 4 steps

  1. 01Enable the Missive connector from your fastn dashboard.
  2. 02Have each customer authorise their own Missive account, so calls run under their credentials rather than a shared key.
  3. 03Decide which conversations, customers and tags your product needs, map those fields, then enable the actions and triggers you want.
  4. 04Call it from your product and expose it to your agents through the same governed connection.

Why teams use the Missive integration

What you get by embedding it with fastn instead of building it yourself.

  • Ship a Missive integration without building it. Your customers connect their own Missive account inside your product and work their conversations, customers and tags there, with no per-customer code on your side.
  • Handle the part that actually costs time: support volume is spiky, and support teams notice latency immediately. fastn owns the auth, token refresh, rate limits, pagination and breaking-change fixes, so a Missive update is not your on-call problem.
  • One integration serves your product and your agents. The same governed Missive connection powers in-product features and gives AI agents scoped, audited access, so you let support work your customers' queues without leaving your product without wiring it twice.

Used by these teams

Customer SupportOperations

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Often used alongside

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Missive integration FAQ

How do I add a Missive integration to my product?

Enable the Missive connector in your fastn dashboard, then let each customer authenticate their own Missive account. fastn handles the OAuth flow, token storage and refresh per tenant, so there is no Missive client code in your app and no per-customer branch in your codebase. Setup is 4 steps.

Do my customers each connect their own Missive account?

Yes. Every connection is scoped to the individual customer, so each authorises their own Missive account and only ever sees their own conversations, customers and tags. That per-tenant isolation is the point of an embedded integration: you support the long tail of customer setups without maintaining an integration per customer.

Can AI agents use this Missive integration?

Yes. The same connection is exposed to your agents through the fastn MCP gateway, with permissions scoped per tenant and every call audited. An agent posts a summary into a conversation for the team, without emailing the customer.

Who maintains the Missive integration?

fastn does. When Missive changes an endpoint, deprecates a field or alters its auth, the fix lands in the connector rather than in your backlog, and your customers' connections keep working.

Can an agent resolve a Missive conversation end to end?

An agent can read the full history, post replies, change status and route within the permissions you grant it. Every action is attributed and audited, so you can show exactly what the agent did rather than inferring it.

Do I get notified the moment something changes in Missive?

Yes, through event triggers rather than polling, so your product reacts to a new or escalated conversation in near real time.

What can I build with the Missive integration?

A common starting point: let a customer connect their own Missive organisation so team inbox conversations appear inside your product. Teams also use it for the other use cases listed above, and expose it to agents for governed reads and writes.

How much does the Missive integration cost?

It is included. Pricing is based on connected accounts, not on how many connectors you enable, so adding Missive does not change your per-connector cost. You can start free with 3 connected accounts.

Add Missive to your product

Start free with 3 connected accounts. No sales call required, and no per-customer integration code.

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