Google Sheets Script to Automate Gmail Search and Import CSV

Hi everybody, This is task for someone with google app script knowledge + advanced google sheets knowledge I am trying to create a Stock Portfolio Spreadsheet that can automatically search my Gmail inbox for (specifically titled emails, that have specifically titled) CSV attachments, and then import them onto a secondary Sheet of the aforementioned Stock Portfolio Spreadsheet. The script should adhere to a time-driven (clock) trigger and run once daily, and should be able to run as a background task (not requiring the Spreadsheet to be manually opened in order for the script to run) I will also require some instructional comments either in the script itself or separately that inform me of the modifiers for the; Sheet name, email title and file attachment title, so that I could edit them to my preference. Once the CSV file has been successfully downloaded and imported into my existing Spreadsheet, an IMPORTRANGE or similar function will be required for the existing spreadsheet to copy the new data across from the imported CSV file. This process will then repeat itself every weekday, possibly overwriting the previously imported CSV file