FAQ says pre-approval does not appear as option if dates clash on my calendar. But I have had two queries recently for different days on a blank calendar. I wanted to clarify something in reply to their booking query but when I tried to send message, only option was accept/decline. I chose accept but immediately went through as confirmed booking, wheras in fact we were still discussing their options as per message.
If the only option was accept/decline then the guest sent you a reservation request, not a booking inquiry.
Yes, accepting a reservation request means that the booking is now paid for and confirmed.
A reservation request means that the guest is ready to book the dates. It means that they have clicked on the "Book" button for your listing.
You can respond with questions but you must either accept the booking or decline it within 24 hours.
See the article below by Dave & Deb for the differences between a bookiing inquiry and a reservation request.