Checking your cc for validity on booking.com

Easy way to check your cc for valid on booking.com (kills less cc than try2check or luxchecker)
First you need to make a booking on booking.com for any big chain hotel, then you go to your boking confirmation and press on manage my booking. Then on right hand corner you see option Update credit card, click on that and enter your cc details, click update. If your card is alive you should see following message :

Thank you for updating your card details. We have sent you an email confirming the change in our system.
Any due payment will be processed using the new details. A confirmation email will also be sent after each payment is processed.

If your card is dead you will see following message:

We couldn't update your card
Your new card information doesn't look valid. Please check everything is correct or use a different card.
Why am I seeing this?
We charged your card for £0 to make sure it's valid, but it didn't go through. We think the property will have trouble charging it. Please check that your card:
is active and without a block
can process international transactions

ENJOY!

P.S Do not forget use big chain hotels and make booking for like 6 months ahead so hotel will not preauthorise your card