Content & Documents · Integration
HelloSign
Add HelloSign to your product for your customers, and give your AI agents governed access to it.
Embed a HelloSign integration so your customers can send documents for signature from inside your product using their own account and templates. Access runs through each customer's own credentials, so their documents and permissions apply and your product cannot reach files the connected account could not reach itself. fastn handles per-customer authentication, event delivery, and API upkeep.
In your product
Embedded for your customers. Per-tenant auth, no per-customer code, maintained by fastn.
Let customers send a signature request from your product using one of their own templates.
Read the fields a template expects so your product maps its data to them per customer.
Check the status of a request and retrieve the signed document once everyone has signed.
Trigger your product when a document is signed or declined so the next step runs immediately.
For your AI agents
Governed, audited access for the agents you build, through the MCP server.
An agent prepares and sends a signature request within scoped permissions, with each action logged.
An agent checks which signers are outstanding before a chase-up goes out.
An agent reacts to a completed signature and files the executed document where it belongs.
Example prompt
Send the standard NDA to this contact for signature and tell me as soon as it is signed.
Set up HelloSign in 4 steps
- 01Open the HelloSign connector from your fastn dashboard.
- 02Have each customer authenticate their own HelloSign account.
- 03Map the templates and signer fields your product uses, then enable actions and triggers.
- 04Call them from your product, or expose them to an agent through the MCP server.
Why teams use the HelloSign integration
What you get by embedding it with fastn instead of building it yourself.
- Ship a HelloSign integration without building it. Your customers connect their own HelloSign account inside your product and work their files, documents and versions there, with no per-customer code on your side.
- Handle the part that actually costs time: permissions and versioning are easy to get subtly wrong, and mistakes expose content. fastn owns the auth, token refresh, rate limits, pagination and breaking-change fixes, so a HelloSign update is not your on-call problem.
- One integration serves your product and your agents. The same governed HelloSign connection powers in-product features and gives AI agents scoped, audited access, so you let your product work with your customers' documents in place without wiring it twice.
Used by these teams
Compare with
Docusign
Adobe Acrobat Sign
DropboxOften used alongside
Tools the same teams tend to run next to HelloSign, across other categories.
Shopify
Stripe
Jira
AsanaHelloSign integration FAQ
How do I add a HelloSign integration to my product?
Enable the HelloSign connector in your fastn dashboard, then let each customer authenticate their own HelloSign account. fastn handles the OAuth flow, token storage and refresh per tenant, so there is no HelloSign client code in your app and no per-customer branch in your codebase. Setup is 4 steps.
Do my customers each connect their own HelloSign account?
Yes. Every connection is scoped to the individual customer, so each authorises their own HelloSign account and only ever sees their own files, documents and versions. 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 HelloSign 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 prepares and sends a signature request within scoped permissions, with each action logged.
Who maintains the HelloSign integration?
fastn does. When HelloSign 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.
Whose permissions does the HelloSign integration run under?
Each customer's own HelloSign grant. Where HelloSign holds a library, their existing folder and item permissions apply and your product cannot reach content the connected account could not reach itself. Where it processes content you supply rather than storing it, the call runs under that customer's own credentials and is logged per tenant.
Can my product create or update content in HelloSign automatically?
Where HelloSign supports writes, documents, entries and assets can be created, updated and filed from your product or by an agent within scoped permissions, with each action logged. Where it is a read surface, the same connection serves reads only.
What can I build with the HelloSign integration?
A common starting point: send a signature request from your product using one of their own templates. 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 HelloSign integration cost?
It is included. Pricing is based on connected accounts, not on how many connectors you enable, so adding HelloSign does not change your per-connector cost. You can start free with 3 connected accounts.
Add HelloSign to your product
Start free with 3 connected accounts. No sales call required, and no per-customer integration code.