WhatsApp document bridge: send a file, get the finished file back

Some people will never open a web app, but they'll always send a file on WhatsApp. So I put the workflow where the files already arrive.

Private buildCode not public. Details on request.

What it does

  1. An approved contact sends a document in WhatsApp.
  2. The bridge picks it up and runs it through an existing document workflow, the same one used by the web and Telegram versions.
  3. The finished file is sent back into the same chat.

Nobody installs anything or logs in. The chat they already use is the interface.

Built to be boring

  • Only documents from configured contacts are processed. Everything else is ignored.
  • The webhook listens only on the server itself and is never exposed to the internet. Pairing data stays on the server.
  • Documents are processed one at a time, in order, with retries, so a busy afternoon can't make results arrive mixed up or out of order.
  • Missed events are recovered, so a file sent during a restart still gets processed.

Why it matters

The workflow already existed. What was missing was a way in that didn't ask anyone to change their habits. Most automation works better when it meets people where they already are, and in a lot of businesses that place is a chat app.

Got a task you do every week? Send it to me.

Describe it in a couple of sentences. I'll tell you honestly whether it's worth automating and what I'd build. You don't pay anything unless it saves you time.

Replies in English or Romanian.