A fast automatic program that meets your requirements

Hi! I have a simple website that needs to be automated, ideally i would want it completely using http requests, in worse case scenario it will use selenium headless mode. The tool should be as fast as possible and must support parallel instances so it should be light weight. As input it will take an excel sheet and open up many instances and start booking appointments. On 1st page it will need to verify by email. the website sends code to email address, we will need to use temp emails, it will be much faster if we can get free temp email api. The page is protected by reCaptcha however we have a link that dont have captcha (in worse case scenario we will need captcha solving ). After sucess from 1st page it will goto 2nd page where it will need to enter details from input sheet,. Here we have to select dates for booking, those dates are for embassy booking and if you have ever booked one you will know that they are booked instantly, so basically the tool has to grab those dates as soon as possible. Furthermore the tool should keep refreshing because the bookings can come at anytime and they disappear after 20 seconds due to competition( competitor using bots as well). After successful date selection the form will be subimitted and data will be saved to output sheet