Add/Remove users from Facebook custom audience

Hey there, I know a bit of coding and need help with the integration of the Facebook Marketing API. I want to upload new users (Their names and mail-adresses) to ADD them to a custom audience (user list based) and I want to upload users to be REMOVED from this list. Your tasks: - Provide all files of current Facebook SDK and advise on where to upload on server - Write 2 PHP codes: 1) Code to upload new users to custom audience 2) Code to remove users from custom audience Please use placeholders for the app id, access token etc. I will create an array of users to add or remove and run the code via cronjob. Can you help with this and how much would it cost? Kind regards