Dive currency: divers who haven't dived lately

"Currency" here means how recently someone dived, not money. Set it in Settings → Booking rules → Divers who haven't dived for a while.

A certified diver booking a Dive Tours activity is asked to confirm they have dived, or done a refresher, in the last two years. If they haven't, they can't pay for that dive. They are asked to book your refresher on an earlier date, or to contact you.

To use it, create your refresher as an activity with Bookable online on, then choose it under Refresher activity. It saves as soon as you choose.