Hi. I can design a secure login system supported by SHA256 algorithm so that it can be protected against any hacking intention. It can contain a register system where users can register first and verify their information by email. Once they are verified they will be presented with the authorized web page where your services will be presented. When the user clicks on a service, it will verify the needed permissions and present a customized response, by consulting the database. I can do that by using PHP, MySQL, JavaScript and AJAX operations. As for payments, we can use multiple gateways so that you can accept any payment around the World (as far as you have the needed accounts).