<span style="color: #f3e504; font-size: 150%;" >{{#fas:lightbulb}} </span> For Booking.com virtual cards you can set to adjust the charge automatically to the full amount available on the cardat the time it is charged. To do so create a rule with these settings and specify it in the booking.com "Virtual Card Payment Rule" setting:
*Funds Source: Virtual Card
*Payment value adjustment = choose any except for "None"