Use one of the approved connectivity providers
Going for this option means that the pricing which you set on their booking system will be displayed on your Google profile. It will appear as "official site".
If your booking system is not on the list of approved connectivity partners, then it's worthwhile asking them if they might include it in the future.
Do you use Online Travel Agents to distribute your tickets, tours, activities etc? Then the information displayed in the booking links section will also show prices from those Online Travel Agents.
Use an approved provider
Link to Google’s Things to do API (Application Programming Interface)
This option will require development capabilities and a level of technical expertise. It's best to look at the list of approved connectivity providers (online booking systems) first.
Link to the interface
The ticket editor
Via your Google Business Profile, you can edit ticket prices, product names and a few other product options. These changes will then appear in Google Search results and on Google Maps.
Changes to ticket prices will need to be made manually (as opposed to automatically with a connectivity partner). Keep this in mind if you're a visitor attraction, tour company, or activity provider that works with multiple booking platforms.
This feature is also known as the Google Business Profile editor tool.
How to use the ticket editor