As a seasoned and dexterous Full-Stack Developer, I can attest to my ability to tackle the complex challenges your Laravel e-commerce website presents. With years of experience using HTML, JavaScript, MySQL, and PHP in various projects, I have honed the requisite skills for this assignment.
I am no stranger to Laravel and its unique dynamics, having completed several successful e-commerce integrations that improved user experience exponentially. In addition, I am quite proficient in AJAX functionality-a skill that you explicitly highlighted-and have utilized it in my previous projects to implement loading buttons like the ones you require. This means I can swiftly replace your existing buttons with AJAX loading ones that feature a clean and user-friendly loading bar during processing.
Moreover, I understand the importance of customization in e-commerce checkout processes which makes me adept at implementing unique functionalities such as enabling the billing/shopping checkbox by default on both cart and checkout pages. Drawing from these relevant experiences, I am undoubtedly the best fit for your project. Under my careful watch, you can be rest assured of seamless AJAX integration and an enhanced user experience for your multitenant Laravel e-commerce platform. Let's turn your project vision into reality!