# Sending an Invoice

{% hint style="success" %}
Not: Sending the API key as Authorization:Bearer {API\_KEY} in the Header field of your service calls will be enough for the API to recognize and authorize you.
{% endhint %}

## Authentication

<table data-header-hidden><thead><tr><th width="377.3333333333333"></th><th></th><th data-hidden></th></tr></thead><tbody><tr><td>AuthenticationSecurity Scheme Type</td><td>Http</td><td></td></tr><tr><td>HTTP Authorization Scheme</td><td>Bearer</td><td></td></tr><tr><td>Bearer Format</td><td>APIKEY</td><td></td></tr></tbody></table>