checkout_complete
event is treated when using e-commerce tracking.
To track a custom event as a conversion, define it in your Conversion Events setting.
trip_booked
is listed in Settings > Conversion Events, it will count as a conversion in your reports, and thus will also affect conversion rate.
booking_destination
, booking_revenue
) in your event payload and make them visible in reporting by:
For more info, see Creating Custom Dimensions & Metrics