Create Document Parser/Flatten PDF files & convert to PHP in drupal Module

Hi, I am Looking to create a Document parser which will parse/ flatten all the data fields for roughly 12 specific documents. These Documents are derived from our email, and will need to create an api from Gmail to store the data into google drive, and then Parse the Document into PHP to be stored in our server. We use mysql and drupal. We would like to have this coded in PHP. We will ultimately be taking this data and putting it into our own databases for utilization and also to be exported as a csv file. The Primary Function here is to Create the workflow and from gmail, store the files, and then parse the Data. If good work is done, I have another Project that is Similar but More along the lines of OCR Recognition, and barcode scanning.