[status-link] (required) will be converted to booking status link
[booking-id] (optional) will be converted to booking id
[booking-table] (optional) will be converted to booking table
[payment-table] (optional) will be converted to payment table
[booking-pdf-link] (optional) will be converted to booking PDF link
[custom-approved-email-text] (optional) will be converted to text added to booking in booking-