Invoice Ninja API Documentation

This is the complete API documentation for connecting to the Invoice Ninja API using MindCloud's Universal API. If you are new to MindCloud, start with the Introduction to see how one API can sit in front of many different apps.

MindCloud is an integration company that offers one normalized API to access 3,100+ apps from a single place. It cleans up provider-specific quirks, keeps requests and responses consistent, and centralizes authentication so you do not need to manage separate flows for every app. Browse other apps.

Meet Invoice Ninja: Create invoices, manage clients, track expenses, and get paid. Keep reading to get started.

Quickstart

Before you run your first Invoice Ninja request, you need three things:

1. A MindCloud account — sign in or create an account at MindCloud.
2. A MindCloud API Key — create one in API Keys. Keep it on your server.
3. At least one Invoice Ninja connection — create or choose one in Connections. Note its connectionId.

Every Invoice Ninja action uses the same URL pattern:

https://connect.mindcloud.co/v1/universal/invoiceNinja/latest/actions/{actionSlug}

You need a MindCloud API Key and a Invoice Ninja connection. Then call an action such as Client Statement PDF:

curl --request GET \
  --url "https://connect.mindcloud.co/v1/universal/invoiceNinja/latest/actions/client-statement-pdf" \
  --header "Authorization: Bearer $MINDCLOUD_API_KEY" \
  --get \
  --data-urlencode "connectionId=$CONNECTION_ID"

Every response comes back in the same envelope, with your rows in a data array:

{
  "success": true,
  "data": [
    { "id": "1042", "name": "Ava" }
  ],
  "meta": {}
}

After your first request works, use Shape your requests to control arguments, pagination, filtering, fields, and errors.

Authentication

Authentication has two layers. Your MindCloud API Key authenticates the request to MindCloud, sent as a Bearer token in the Authorization header. The connectionId selects the connected Invoice Ninja account that should run the action. MindCloud stores and refreshes the Invoice Ninja credentials behind that connection, so you never send provider tokens with your requests.

Pass connectionId in the query string for GET and DELETE actions, and in the JSON body for POST, PUT, and PATCH actions. Keep your MindCloud API Key on your server; do not ship it in browser code, mobile apps, public repositories, or logs.

Invoice Ninja actions

All 40 published actions for this Invoice Ninja version. Each page documents the endpoint, arguments, and response controls.

• PUTBulk Client Actions
• PUTBulk Invoice Actions
• PUTBulk Quote Actions
• GETClient Statement PDF
• POSTCreate Client
• POSTCreate Expense
• POSTCreate Invoice
• POSTCreate Payment
• POSTCreate Product
• POSTCreate Quote
• POSTCreate Recurring Invoice
• POSTCreate Vendor
• PUTCustom Invoice Action
• PUTCustom Quote Action
• GETDownload Invoice PDF
• GETDownload Quote PDF
• GETList Clients
• GETList Expenses
• GETList Invoices
• GETList Payment Terms
• GETList Payments
• GETList Products
• GETList Quotes
• GETList Recurring Invoices
• GETList Tax Rates
• GETList Vendors
• PUTRefund Payment
• GETShow Client
• GETShow Invoice
• GETShow Payment
• GETShow Product
• GETShow Quote
• GETShow Recurring Invoice
• PUTUpdate Client
• PUTUpdate Invoice
• PUTUpdate Payment
• PUTUpdate Product
• PUTUpdate Quote
• PUTUpdate Recurring Invoice
• PUTUpdate Tax Data

Related apps

More Commerce apps on the Universal API, behind the same REST shape. Or browse all apps.

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