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Connectors / Finance · HTTP Connector
Automate Invoice Ninja with Tray.ai
Create a client, create an invoice and create a quote in Invoice Ninja. Connect Invoice Ninja to the rest of your finance stack with Tray.ai.
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What can you do with Invoice Ninja on Tray.ai?
Invoice Ninja is invoicing and billing software for freelancers and small businesses, covering clients, quotes, invoices, recurring billing, payments, expenses, and time tracking. Tray.ai connects to Invoice Ninja through the HTTP Connector, so your workflows can call the Invoice Ninja API alongside the rest of your stack.
- Connects through
- HTTP Connector
- Authentication
- An API key in a request header
- Base URL
- https://invoicing.co/api/v1
What the Invoice Ninja API covers
6 resources and 22 documented actions, each one a call the HTTP Connector can make from a Tray.ai workflow.
Clients
- List clients
- Create a client
- Edit a client
- Delete a client
Invoices
- List invoices
- Create an invoice
- Edit an invoice
- Delete an invoice
- Download an invoice PDF
Quotes
- Create a quote
- Edit a quote
- Delete a quote
- Download a quote PDF
Payments
- Create a payment
- Edit a payment
- Delete a payment
Recurring invoices
- Create a recurring invoice
- Edit a recurring invoice
- Delete a recurring invoice
Expenses
- List expenses
- Add an expense
- Delete an expense
Checked against Invoice Ninja's own documentation on 2026-10-22
How Tray.ai makes this work
Invoice Ninja plugs into the whole Tray.ai platform
Intelligent Integration
Integrate and automate across 700+ connectors with visual workflows, error handling, and observability.
Learn more →Agent Builder
Build AI agents that read, write, and take action in Invoice Ninja — with guardrails, audit, and human-in-the-loop.
Learn more →Agent Gateway for MCP
Expose Invoice Ninja actions as governed MCP tools — observable, rate-limited, authenticated.
Learn more →More finance apps on Tray.ai
Dedicated connectors and other apps Tray.ai reaches in the same category. See every finance connector →
Frequently asked questions
What can a Tray.ai workflow do in Invoice Ninja?
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The Invoice Ninja API documents 22 actions across 6 resources (Clients, Invoices, Quotes, Payments, Recurring invoices, Expenses). For example: List clients; List invoices; Create a quote. A workflow can make any documented call through the HTTP Connector.
How does Tray.ai authenticate with Invoice Ninja?
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The Invoice Ninja API uses an API key in a request header. You save it once as a Tray.ai authentication, and the HTTP Connector adds it to every request.
See Invoice Ninja working against your stack.
We'll walk through a tailored demo with your systems plugged in.
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