Mavenlink

Mavenlink Invoices API

Users can create Invoices in a Kantata OX project. An Invoice must have at least one line item (a time entry, expense, fixed fee item, or additional item). By default, the recipient of an invoice is the primary client in the project. Manual formatting options are available to define the format and information that should be displayed on an invoice. Invoices can only be created and viewed by participants with financial permission in a project.

Documentation GitHub OpenAPI

Business capability

Accounts Receivable Management BC-200.30

Operations 7

GET /invoices Fetching a list of Invoices #

POST /invoices Creating a new Invoice #

GET /invoices/next_invoice_number Retrieve the next available invoice number #

GET /invoices/{id} Fetching a single Invoice #

PUT /invoices/{id} Updating an existing Invoice #

DELETE /invoices/{id} Deleting an existing Invoice #

PUT /invoices/{id}/cancel Cancel an existing invoice #

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OpenAPI Specification

openapi: 3.2.0
info:
  version: 1.0.0
  title: Kantata OX API Documentation Invoices API
  description: Kantata OX's API provides access to the majority of Kantata OX's data model.
  termsOfService: https://www.kantata.com/terms-of-use
  contact:
    name: Kantata OX Support
    url: https://knowledge.kantata.com/hc/en-us
  license:
    name: COPYRIGHT © 2026 Kantata, Inc.
    url: https://www.kantata.com/terms-of-use
  x-logo:
    url: https://theme.zdassets.com/theme_assets/56104/04e93064d309f75d054b8cee885d1ea51e9be8f7.png
    backgroundColor: '#FFFFFF'
    altText: Kantata OX API Documentation
    href: https://developer.kantata.com
servers:
- url: https://api.mavenlink.com/api/v1
tags:


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