Required fields
You can mark a field as required when creating it in the admin.
When creating an order in the point of sale app, if any required fields are missing the Tile will be highlighted. The colour of the tile will change, and the number of missing required fields will be shown in the badge.
It is still possible to complete a checkout if a required field is missing.
If you would like to set up an additional check, you can use Shopify Flow to send an alert or take further action.