Build a Wordpress plugin

We are looking for a Wordpress plugin with the requirements stated below: 1) You need to take input from the user for API secret and the token and store in a way that it should be accessible again. 2) The plugin when installed must automatically be able to fetch code from the given URL's and store it in the Wordpress root directory as PHP files when user installs the plugin. We will provide you with the URL's shortly. Like for example, if our file is [login to view URL] and when it's placed in Wordpress directory, we need to access it from [login to view URL] 3) You need to give us the snippet code for the PHP files to grab API keys and secret. PS: All the PHP files are function and working.