When using the Mailgun Add-On in Gravity Forms, you』ll need to be able to authenticate your site with Mailgun. This is done using an API key assigned by Mailgun. In this article, we』ll show you how to obtain your Mailgun API key.
Log into your Mailgun account.
From the top right navigation menu, click on your name and then Security.
Under API Keys, locate the Private API Key field. Click on the eye icon to the right of the field to display your API key.
That』s all there is to it! From here, you can continue setting up the Mailgun Add-On or start sending form notifications using Mailgun.