There are three different ways to authenticate.

X-API-KEY request header

Used in most end points sometimes in combination with a JWT (Json Web Token) when information about the user is required. How to find your account api keys

Basic Auth

Used to retrieve a JWT for a given user. You can sign using your username and password and Basic Auth to retrieve your JWT. How to sign up using Basic Auth

Json Web Token (JWT)

A JWT will be required for destructive endpoints or endpoints that reveal more sensitive information. You can retrieve your JWT signing up with a username and password into the api

How to use your JWT