The admin (owner) of the account has access to the account's profile settings (accessible here) where you can find your account's API key if your plan allows for this.

We offer API access to customers on some of our plans. See our pricing page for the latest details, or reach out to our support team and we'll be happy to check whether your plan has API access.

If available, your API key can be found in your admin account. It is not available within staff user accounts.

Login as the admin user, then click your user icon in the upper right hand corner of the screen, and select "Profile".

Next, from the settings page menu, select "Company Details". The API key will be on this page, close to the bottom.