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:

POST https://connect.mindcloud.co/v2/universal/apps/invoiceNinja/actions/{actionSlug}/run

You need a MindCloud API Key and a Invoice Ninja connection. Then call an action such as List Payment Terms:

curl --request POST \
  --url "https://connect.mindcloud.co/v2/universal/apps/invoiceNinja/actions/list-payment-terms/run" \
  --header "Authorization: Bearer $MINDCLOUD_API_KEY" \
  --header "Content-Type: application/json" \
  --data '{
  "connectionId": "$CONNECTION_ID",
  "arguments": {}
}'

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.

Authenticate with a MindCloud API Key plus a connectionId for your Invoice Ninja account. See Invoice Ninja API Authentication for the full flow and how to get your connection credentials.

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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