3. OTA Gateway (Bnovo) Manager will connect your Hotel Ads account to Hotel Center. After that you'll have to proceed to Google Ads > Connected accounts and confirm the synchronization.
4. OTA Gateway manager connects hotel to GHA (The connection procedure can take from 2 to 14 days), after that the hotel(s) will appear in your Google Ads account and will be available for setting up advertising campaigns
5. Your company set up hotel advertising campaigns in your Google Ads account and manage bids independently.
6. If you are setting up advertising campaigns using the CPC model, then you need to install the Google Conversion tracker into your booking engine
You can find the installation instructions
here (ссылка на вторую статью)
Once all settings are complete, a direct booking button will appear on the Google property page.