Best Available allows you to offer the best seats to your users automatically, skipping the process of manual selection. You can still allow them to pick different seats afterwards if you so desire.
The best seats are considered those closest to the Focal Point.
To use this feature, you need:
A chart with a Focal Point
Call the Best Available API endpoint
Placing a Focal Point
When editing a chart on the Designer, use the Focal Point tool to place it or relocate it in the chart:
The Focal Point is usually placed at where the action is in the venue: the stage in a theatre, the field on a stadium, and so on.
Booking the best available seats
When showing a venue to a ticket buyer, you can give them the option to automatically have the best seats chosen for them.
To obtain these seats, you can make an API call to the Best Available endpoint from your server, which will automatically assign (i.e. hold, book, etc) the seats to the end user.
Note that the Best Available API endpoint is not designed to simply request or find the best available seats.
This is by design. If you would simply request the best available seats with the intent to book them later, there's a chance those seats might no longer be available the moment you book them. Essentially, the availability of seats is fleeting, and should be treated accordingly. That's why the API endpoint only lets you book/hold best available seats immediately, to make the selection permanent.