35 Invoicing APIs: PayPal, FreshBooks and Blinksale

Our API directory now includes 35 invoicing APIs. The newest is the CashFlows API. The most popular, in terms of mashups, is the PayPal API. We list 33 PayPal mashups. Below you'll find some more stats from the directory, including the entire list of invoicing APIs.

In terms of the technical details, REST and XML lead the way. There are 28 invoicing REST APIs and 6 invoicing SOAP APIs. Our directory lists 30 invoicing XML APIs and 17 invoicing JSON APIs.

The most common tags within invoicing are 14 enterprise invoicing APIs, 13 finance invoicing APIs and 10 billing invoicing APIs

On the mashup side, we list 5 invoicing mashups. We named Mobile Time Tracking as mashup of the day in August.

For reference, here is a list of all 35 invoicing APIs.

  1DayLater API: Business expense tracking tool

  ActiveCollab API: Collaboration & Project Management System

  billFLO Seller API: Invoice management service

  billomat API: Online billing service

  Blesta API: Billing Service

  Blinksale API: Online invoicing services

  Bunker App API: Project management Platform

  Cashboard API: Financial and time tracking service

  CashFlows API: Web and mobile payment platform

  ClientBill API: Online invoicing service

  CurdBee API: Online billing software

  e-conomic API: Online accounting software

  entreprise-facile API: Create entreprise-facile automations and mashups

  fetchflow API: Online invoicing and payment service

  FreshBooks API: Online invoicing and time tracking

  Greendizer API: Invoicing designed for developers

  Invoice Machine API: Invoice management service

  InvoiceClarity API: Invoice management service

  Invoicefu API: Online invoicing service

  Invoicera API: Invoicing & Billing Service

  Klarna API: eCommerce service

  Less Accounting API: Online accounting service

  Maventa e-invoicing API: Electronic invoicing services

  MoneyBird API: Online billing service

  Ofuz API: Customer management and invoicing service

  PayPal API: Online payments

  PayPal Invoicing API: PayPal Invoicing APIs

  Seasoo API: Online invoicing service

  ServiceM8 API: Service job management service

  serviceminder API: Service provider online solution service

  Stripe API: Online payment service

  Tradeshift API: Business Network and Invoice management service

  WorkflowMax API: Job and Invoice Management

  Xero API: Online accounting service for SMBs

  Zoho Invoice API: Online invoicing service

Be sure to read the next Invoicing article: PayPal Announces Invoicing API