Introduction
What’s an API and What is it for?
API (Application Programming Interface) is a way for third party developers integrate Invoic€xpress into their applications, allowing them to send invoices programatically without visiting the Invoic€xpress website.
The Invoic€xpress API uses a REST aproach and accepts XML as a request format.
On HTTP POST and PUT requests do not forget to specify the “Content-Type: application/xml” .
An example, let’s say you have an online store, and need to invoice your clients after each successful purchase, normally you had to develop all the code to manage the creation and sending of the invoice (with all the underlying logic, ex:managing clients, products, taxes, invoice numbering).
Using the Invoic€xpress API you just need to make a HTTP POST request with the invoice data as XML to our API to create one.
How can I start?
1) If you don’t have an Invoic€xpress account, register for one (you can try it for free)
2) Get your unique access token in the Settings >> Personal Info >> Activate Token
3) Start integrating the API Calls into your application
4) Start sending invoices from your app