Crypto Currency PHP / Mailer Script

I'm looking to have a pure PHP script developed (no frameworks) that will allow me to send an email to my server via e-mail address (crypto@[login to view URL]) and automatically reply to me with the requested info. Please keep code neat and well commented. Specific functions: - All number values EXCEPT for price should be formatted to round to largest value and delineated with B for Billion, M for Million, K for thousand. - Only allow this to work for a white-list of emails written in the script - Ignore and do not reply to any other emails - allow multiple commands, one per line - every return email must have date and time the info was retrieved at the top. Commands in body of e-mail: "get" = grab information from [login to view URL] "price" returns "(P) $##,###.##" "market cap" = (MC) $163.44B" "volume" = (24HR/Vol) $20.27B" "current supply" = "(CS) BTC 18.02M "% change" = (24HR/%) +/- 2.7% "top 10" = show top 10 currencies by market cap in this format: 1. BTC (MC) $163.4B (P) $9,057.47 (24HR/Vol) $20.27B (CS) BTC 18.0M (24HR/%) +2.70% "top 5" = do the same as above but for the top 5. Example email sent to server (crypto@[login to view URL]): "get LTC price" Returns: "10-NOV-2019 @ 13:24 --------------------------------------------------------------- LTC (P) $64.07"