Related Clues:

• A written acknowledgement
• Evidence of sale concerning place in theatre, we hear
• Price set wrongly with no end of fuss? It comes from the till
• It often says 'Thank You'
• Proof of purchase put back in pot – piece retained
• Right about returned item -- proof of purchase required
• Return of concert piece rarely involves acceptance
• Exchange need
• Checkout slip
• Bill may get such an acknowledgement
• Proof one's settled right round westward part
• Acknowledgement of order, not the first I received
• Evidence of having paid wrong price, including energy, on time
• Need for a return, usually
• You may need this to pick up items at the cleaners