It is the only national reaching Gift Card and eGift scheme that is available to be purchased at certain participating theatres and retail outlets.
Theatre Tokens are issued by The Society of London Theatre (SOLT), a not-for-profit organisation representing the London theatre industry.
You can add Theatre Tokens as a Payment Method on your Settings page and that can be used for bookings on the Box Office page and on your Customer-Facing Booking Flow.
You just need to have signed up with Theatre Tokens before doing this - see here for more info.