When someone says, "invoicing," do you think: "speed"? Debitoor is designed to get a small business up and running fast--so you can start generating those all-important invoices and get paid faster. The Debitoor API allows a third party app to set up an invoice (such as a point-of-sale app). Debitoor is RESTful API with responses in JSON, according to the API documentation. It joins 48 accounting APIs listed in our API directory.