Use Terms of Service
This shows the Terms of Service checkbox on the booking widget before customer click Book button on and checkout.

Enable the option in the app settings
Open the app > click Settings > General
Tick on the checkbox User Terms of Service
Save the settings

Edit text and link of the checkbox
Go to the Translation section of the app > click Term tab
Edit text in the fields Terms label and Terms label of url
Add the URL you want to link to the text of the checkbox to Terms url field
Save it

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