You will be able to generate an API key necessary for using API.
From the hamburger menu on the Global Navigation Bar, click on [Settings].
Select [Project Settings], and click on the desired Project within the Project list.
From the [API] column within [Project Details], click on the Add icon (plus sign).
From [Generate API key], click on the [Generate] button.
The generated API key will be displayed in the [API] column within [Project Details].
References for using API
Please refer to the following URLs for information on using API.