Navigate to the API Access Dashboard here.

Ensure you are in Live mode, not Test mode.

Click Create Restricted Key.

Name the key > Blue Onion.

Give Read access for all resources (Callout - make sure to scroll down as there is a long list).

Click Create Key.

A new line item should appear under Restricted Keys with the name BlueOnion.

Click Reveal Token to show the hidden token.

Copy the Key into Blue Onion > Payment Processors > Stripe (Callout - if read access is not available, access level = None).