Navigate to your My Account screen, found in the Settings menu on the left. Once you scroll to the bottom of this page, click the Show button to reveal your API key for you to copy as needed.
Resetting your API Key
Has your website been hacked, or your API key become compromised?
Just click on the red Reset API Key button to trigger a confirmation window. As the dialog box will state, resetting your API key will block all existing clients. After you click OK to accept, the new key will appear. The old key is immediately destroyed and you will need to update all your programs and services with the new key.