parameter key_hash;
storage (pair timestamp (pair tez key_hash));
return unit;
code { DUP; CDAR; DUP; NOW; CMPGT; IF {FAIL} {}; SWAP; # Check if auction has ended
       DUP; CAR; DIP{CDDR}; AMOUNT; PAIR; SWAP; DIP{SWAP; PAIR}; # Setup replacement storage
       DUP; CAR; AMOUNT; CMPLE; IF {FAIL} {};  # Check to make sure that the new amount is greater
       DUP; CAR;                               # Get amount of refund
       DIP{CDR; DEFAULT_ACCOUNT}; UNIT; TRANSFER_TOKENS; # Make refund
       PAIR}                                             # Calling convention