It will be at the top of your Extranet screen. If you are talking about your verification ID then you need to contact booking.com help team using Inbox icon on Extranet or give them a call see link for local phone numbers.
Hi, how can I confirm the location if this is my secondary place and my main residence is in another country. There is currently nobody at the rental place and
I have not received the letter confirming my address. It was mailed on March 18. Please mail another letter asap or advise of what I should do next. Thank you
It will be at the top of your Extranet screen. If you are talking about your verification ID then you need to contact booking.com help team using Inbox icon on Extranet or give them a call see link for local phone numbers.
https://partner.booking.com/en-us/help/where-you-can-reach-us