I need a lightweight, fully-functioning booking module built in clean HTML / CSS (with any vanilla JavaScript or PHP you think is needed) so guests can reserve my holiday apartment directly from my website. it can either be integrated in the website or extern Core requirements • Real-time calendar that blocks dates instantly after each successful reservation. • Secure checkout that takes Credit/Debit cards and PayPal; guests who prefer can choose “Pay cash on arrival” and still get a confirmed booking. • Automatic confirmation email to both the guest and me, summarising stay details and payment status. The widget should drop into my existing page without redesigning the whole site—simple, responsive markup I can style later is enough. As long as it looks tidy and the code is well commented, I’m happy. Please deliver: 1. All front-end and back-end files. 2. Clear setup instructions (database schema, API keys or webhooks, etc.). 3. A short test plan proving the calendar, payments and email work end-to-end. If you’ve done similar property or hotel booking tools before, let me see a live link or screenshots so I know your approach will mesh with my site.