Automatically sign PDFs from a watched Google Drive folder with PDF API Hub

Description

Auto E-Sign PDF — Google Drive Watcher

Automatically signs PDF documents the moment they land in a Google Drive folder — no manual steps needed. The signed output is routed to a Drive folder.

How it works

Google Drive Trigger watches a folder every minute for newly created files
Download file fetches the file from Drive into the workflow
Config sets your signature URL, position (x/y), and output method (drive or email)
Is PDF? filters out non-PDF files — only PDFs proceed
Sign a PDF overlays your signature image at the configured coordinates using PDF API Hub
Output Router sends the signed PDF to Drive
Log records the filename and signed status for auditing

Setup

Credentials
Google Drive OAuth2 (trigger + download + upload nodes)
PDF API Hub API key — sign up at pdfapihub.com

Configuration (in the Config node)
| Field | Description |
|---|---|
| signature_url | Public URL to your PNG signature image |
| sign_x / sign_y | Pixel coordinates for signature placement |
| output | drive to save to Google Drive, email to send via email |
| email | Recipient address (required only if output = email) |

Folder setup
Set your watch folder in the Google Drive Trigger node
Set your output folder in the Upload file node

Notes
Signature image should be a PNG with a transparent background for best results
Non-PDF files dropped into the watched folder are silently skipped