Yes, it is applicable to BookingWizz if you’re accepting payments using PayPal in our system. 

BookingWizz uses IPN (Instant Payment Notification) from PayPal to update status of the booking to “Paid” once customer has paid using PayPal. 
This article contains more information on what paypal is doing to IPN in 2016. 

Next BookingWizz update will contain the necessary adjustments for this new requirements which will take effect in September 2016.

Unfortunately, there’s no ETA at this moment, as the next release for BookingWizz will be a major update we’re working on.