You can now choose if the payment link should require 3DS authentication (recommended) or not.
For some cards there are issues with 3DS (for example not enabled at all). In that case you simply de-select 3DS and generate the payment link:
When you send a Payment Link via email then you can both press a button and a link to submit credit card information.
This is so that OTA´s such as Booking.com/Expedia who block buttons will not prevent the user from submitting payment link information.