Summary
Connecting Booking.com to Host Tools is a two-stage process: first, you authorize Host Tools as your connectivity provider on Booking.com, then you link the property to your Host Tools account by entering its Booking.com Property ID.
⚠️ Important — one Booking.com account per listing. Booking.com authorizes connectivity per property, not per login. Each listing on Booking.com has its own unique Property ID and is added to Host Tools as a separate Booking.com account, even if all your listings share the same Booking.com login email. If you have five Booking.com properties, you'll have five Booking.com accounts in Host Tools. This is a Booking.com platform requirement, not a Host Tools choice.
Authorizing Host Tools on Booking.com
Do this once per listing you want to connect.
Log in to your Booking.com extranet and select the listing.
From the listing's page, click Account in the top-right corner.
In the drop-down, click Connectivity provider.
Click the blue Search button under Connectivity provider.
Type Host Tools in the search bar.
When Host Tools appears in the results, make sure all of the connectivity option boxes are ticked, then check the Terms and Conditions box.
Click Connect.
Booking.com will confirm the connection. This can take a few minutes — keep an eye on your Booking.com inbox for a "Connection activated" message.
Linking the property to Host Tools
Go to HostTools.com and click your profile picture in the upper right-hand corner.
Choose Link account from the drop-down menu if these listings do not already exist in Host Tools.
Select Booking.com as the channel.
Enter the Booking.com Property ID for the listing you just authorized and click Add Account.
If you already have this listing in Host Tools from Airbnb, or Vrbo, then you will click the "+" sign next to add channel, and then follow steps 3-4 above.
You're all set — the listing's reservations and calendar will start syncing into Host Tools.
Adding more Booking.com listings
For every additional Booking.com listing you want on Host Tools, repeat both steps above — authorize Host Tools as the connectivity provider on that property's Booking.com page, then link it to Host Tools using its Property ID. Each listing becomes a separate Booking.com account in your Host Tools Settings > Channels view.
Why isn't it one account with multiple listings?
Booking.com's connectivity API authenticates and authorizes Host Tools per Property ID, not per login email. Host Tools mirrors this — one Booking.com Property ID corresponds to one account record in Host Tools. There's no way to fold multiple Booking.com properties into a single account, because Booking.com doesn't expose that capability to connectivity partners.
See also
For an overview of channel connections in Host Tools, see How do I connect a new channel (Airbnb, VRBO, Houfy, etc.) to a listing?.