To enable Guest Checkout in your Format Store (bypassing the need to have a PayPal account you need to change a preference within your PayPal Business Account settings.
PayPal Business Account Settings
In your PayPal Business Account click on your name in the top-right corner to access the dropdown options
Click 'Account Settings'
From the left sidebar under PRODUCTS & SERVICES click 'Website payments'
To the right of 'Website preferences' click the 'Update' text link
Enable Guest Checkout
Scroll down
To the PayPa account optional
Select 'On'
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