Hi Simon,
Thank you for sharing your suggestion!
We understand how useful it would be to restrict coupon codes to bookings with specific check-in days, such as Monday or Tuesday, while also encouraging longer stays of three nights or more.
Currently, the Hotel Booking plugin does not offer an option to set specific check-in days for coupon codes. However, your suggestion makes sense, and we will forward it to our development team for consideration as a potential feature enhancement.
While we cannot guarantee if or when this functionality might be implemented, we appreciate you taking the time to share your idea with us.