As an expert in web development and design with a decade of experience in HTML, CSS, JavaScript, PHP, and WordPress, I am eminently qualified to bring your vision for the "WordPress OTP Login/Registration Implementation" project to fruition. I've not only honed my skills over time, but consistently delivered high-quality results as evidenced by my extensive portfolio and consistent 5-star feedback. Rest assured, if chosen for your project, that same level of quality will be poured into every line of code and fine-tuned to meet your specific needs.
I understand the key functionalities you seek including the "My Account Access Behavior", OTP authentication mechanism and checkout page modification ensuring streamlined user experience without sacrificing security. My deep programming and UX/UI skill set will allow me to create a login/register popup which promotes seamless SMS or email verification. With this mechanism in place, existing customers will have easy access to their accounts on checkout, nurturing trust-based relationships.
Moreover, I am fully aware of your concerns regarding altering the flow or structure of the website or database. Great empathy exists between us on this point, as I too prioritize integrating new functionalities smoothly into existing setups. My thoroughness as well as my drive to learn and improve ensures that you'll receive a product tailored perfectly to your needs without affecting what already works well for you.