Programmatically Generate Documents from Templates [Google Drive API]

I need a script generates documents from templates and programmatically uploads these generated documents to a specific Google Drive folder. Step 1: Collect fields about a customer. (name, phone, address) Step 2: Programmatically modify documents and insert data into document. Step 3: Upload modified document to Google Drive through API Example: In a GUI, a User enters: customer name, phone number, and address. Your script will programmatically modify the template and insert customer information at specific points in the document. It must also upload the modified document into a Google Drive folder through the Google Drive API. Python language preferred. All languages welcome.