The answer is Yes!
Since the GDPR came into effect, your end customers are obliged to accept both your terms and conditions and your data protection declaration when they buy your services and/or products.
Under Account > Company data you can upload your general terms and conditions and your data protection declaration. General terms and conditions, the data protection declaration and your legal notice should be included in your bookingkit account as well as directly on your website. Your end customers do in any case have the opportunity to look at these on your website at any time in your integrated bookingkit widget:
During the ordering process in Checkout your end customers also have to accept your terms and conditions and data protection declaration separately again, by ticking a box: