Puck.js as fuel dispenser logger

Is it possible to use Puck.js as a fuel dispenser logger?

What I have in mind:

• Install Puck.js on vehicle. Attach vehicle plate number information to Puck.js.
  
• Install magnet or Puck.js on fuel dispenser handle.
  
• When refueling, Puck.js on vehicle will be close to magnet/Puck.js on fuel dispenser handle.
  
• This will trigger the Puck.js on vehicle to send vehicle plate number information to nearby phone.
  
• Phone will use this information together with refueling time, phone location to log the refueling event.
  
• Once refueling is completed, puck.js stop sending vehicle plate number information.
  
  

Possible issues

• Fuel dispenser handle is made of metal too. Will the magnet on fuel dispenser work for Puck.js to detect?
  
• How does Puck.js on fuel dispenser trigger the Puck.js on vehicle to send information to phone?
  
  

Is there a better way to log fuel dispenser usage?