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Connectors / Sales · HTTP Connector
Automate Sellsy with Tray.ai
Create a company, create a contact and create an opportunity in Sellsy. Connect Sellsy to the rest of your sales stack with Tray.ai.
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What can you do with Sellsy on Tray.ai?
Sellsy is a French business suite for small companies that combines a CRM with quotes, invoicing, payments, and pre-accounting. Tray.ai connects to Sellsy through the HTTP Connector, so your workflows can call the Sellsy API alongside the rest of your stack.
- Create an invoice in Sellsy when a project is marked complete in your project tracker.
- Create a contact for each new web form lead so sales can follow up.
- Update an opportunity when a quote is signed in your e-signature tool.
- Create a task for the account owner when a support ticket is escalated in your help desk.
- Connects through
- HTTP Connector
- Authentication
- OAuth 2.0
- Base URL
- https://api.sellsy.com/v2
Set it up
Connect Sellsy to Tray.ai
Each step uses Sellsy's own API details, from its documentation.
Step 1
Sign in to Sellsy with OAuth 2.0
Set up an OAuth 2.0 authentication with the client ID and secret of an OAuth app you register with Sellsy. Sign in once and every step reads the token from there.
Step 2
Point the HTTP Client at the API
Add an HTTP Client step and use https://api.sellsy.com/v2 as the base URL. Or paste a cURL example from Sellsy's API docs, and Tray.ai fills in the method, URL, and headers.
Step 3
Start with “List companies”
It's one of 22 documented actions, under Companies. The response comes back as data the next step can map into your other apps.
Step 4
Hand it to an AI agent
Wrap “Create a company” and “Update a company” in workflows, and Tray.ai's Agent Gateway for MCP publishes them as governed tools Claude and other AI agents can call.
What the Sellsy API covers
6 resources and 22 documented actions, each one a call the HTTP Connector can make from a Tray.ai workflow. Connecting it takes a few clicks: here's how.
Companies
- List companies
- Create a company
- Update a company
- Delete a company
Contacts
- List contacts
- Create a contact
- Update a contact
- Delete a contact
Opportunities
- List opportunities
- Create an opportunity
- Update an opportunity
- Delete an opportunity
Invoices
- List invoices
- Create an invoice
- Update an invoice
Estimates
- List estimates
- Create an estimate
- Update an estimate
Tasks
- List tasks
- Create a task
- Update a task
- Delete a task
Checked against Sellsy's own documentation on 2026-10-22
How Tray.ai makes this work
Sellsy plugs into the whole Tray.ai platform
Intelligent Integration
Integrate and automate across 9,000+ apps, databases, APIs, and services with visual workflows, error handling, and observability.
Learn more →Agent Builder
Build AI agents that read, write, and take action in Sellsy — with guardrails, audit, and human-in-the-loop.
Learn more →Agent Gateway for MCP
Expose Sellsy actions as governed MCP tools — observable, rate-limited, authenticated.
Learn more →Tray Helix
Build apps on Sellsy data with your AI assistant, then deploy, run, and govern them on Tray.ai.
Learn more →More sales apps on Tray.ai
Dedicated connectors and other apps Tray.ai reaches in the same category. See every sales connector →
Frequently asked questions
What can a Tray.ai workflow do in Sellsy?
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The Sellsy API documents 22 actions across 6 resources (Companies, Contacts, Opportunities, Invoices, Estimates, Tasks). For example: List companies; List contacts; List opportunities. A workflow can make any documented call through the HTTP Connector.
How does Tray.ai authenticate with Sellsy?
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The Sellsy API uses OAuth 2.0. You save it once as a Tray.ai authentication, and the HTTP Connector adds it to every request.
See Sellsy working against your stack.
We'll walk through a tailored demo with your systems plugged in.
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