It can sometimes take a few days for the booking site to communicate your reservation details to the property. If your reservation still isn’t showing up after this time or your stay is scheduled sooner than that, the booking site will be able to assist you.
Upon arrival at the property
In this case, please contact the booking site directly. They are responsible for the booking and payment process, so will be in the best position to help you.
Your booking confirmation will include their contact details.