Basic OTP Admin Panel Automation

I already have a website with a login system (username and password). I need a simple web-based admin panel (console) that allows me to manually approve customer logins by comparing an SMS code. How it should work 1 The customer logs in with their username and password... (Budget: €30 - €250 EUR, Jobs: AJAX, CSS, Frontend Development, HTML, JavaScript, jQuery, MySQL, PHP, Web Application, Web Development)