Arithmetic tasks on a codeigniter project and connecting php to endpoints API using cURL -- 2

We have a running Codeigniter School Information System that needs some tweaking. We have been running it for years but we recently upgraded its UI and some core codes. These are the tasks we need: 1. Login System; here we handle authentication on site but recently changed the login confirmation for students to confirm their Login with a PIN generated on an external API. We need you to connect to the Api endpoints using cURL give authentication and grant access . 2. You will need to populated student report sheet from the scores entered, we changed the UI so we need new codes running. its basically scores such as subject scores, total, grade, remarks, subject position, average grade point. if you need access to the old system to see how we did it we can give you but will prefer a cleaner code in this. Thank you