Contract Source Code (Vyper language format)

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#pragma version ^0.3.0

interface ERC20:
 def transfer(_to: address, _value: uint256) -> bool: nonpayable
 def transferFrom(_from: address, _to: address, _value: uint256) -> bool: nonpayable

interface WETH:
  def deposit(): payable

# configuration state:

admin: public(address)
weth: public(immutable(WETH))
acceptedTokens: public(HashMap[ERC20, bool])

@external
def __init__(_weth: address):
  weth = WETH(_weth)
  self.acceptedTokens[ERC20(_weth)] = True
  self.admin = msg.sender

# state:

paid: public(HashMap[address, HashMap[ERC20, uint256]])
charged: public(HashMap[address, HashMap[ERC20, uint256]])
pendingRefund: public(HashMap[address, HashMap[ERC20, uint256]])

# admin actions:

event SetAdmin:
  old: indexed(address)
  new: indexed(address)

event SetToken:
  token: indexed(ERC20)
  accepted: indexed(bool)

event Withdraw:
  token: indexed(ERC20)
  amount: indexed(uint256)

event Charge:
  user: indexed(address)
  token: indexed(ERC20)
  amount: indexed(uint256)

event Refund:
  user: indexed(address)
  token: indexed(ERC20)
  amount: indexed(uint256)

@external
def setAdmin(_newAdmin: address):
  assert msg.sender == self.admin, "auth"
  self.admin = _newAdmin
  log SetAdmin(msg.sender, _newAdmin)

@external
def setToken(_token: ERC20, _accepted: bool):
  assert msg.sender == self.admin, "auth"
  self.acceptedTokens[_token] = _accepted
  log SetToken(_token, _accepted)

@external
def withdraw(_token: ERC20, _amount: uint256):
  assert msg.sender == self.admin, "auth"
  assert _token.transfer(msg.sender, _amount), "tfr"
  log Withdraw(_token, _amount)

@external
def charge(_user: address, _token: ERC20, _amount: uint256):
  assert msg.sender == self.admin, "auth"
  self.charged[_user][_token] += _amount
  log Charge(_user, _token, _amount)

@external
def refund(_user: address, _token: ERC20, _amount: uint256):
  assert msg.sender == self.admin, "auth"
  self.pendingRefund[_user][_token] += _amount
  log Refund(_user, _token, _amount)

# user actions:

event Pay:
  user: indexed(address)
  token: indexed(ERC20)
  amount: indexed(uint256)

event ClaimRefund:
  user: indexed(address)
  token: indexed(ERC20)
  amount: indexed(uint256)

@external
def payToken(_token: ERC20, _amount: uint256):
  assert self.acceptedTokens[_token], "token"
  assert _token.transferFrom(msg.sender, self, _amount), "tfr"
  self.paid[msg.sender][_token] += _amount
  log Pay(msg.sender, _token, _amount)

@external
@payable
def payEther():
  weth.deposit(value = msg.value)
  self.paid[msg.sender][ERC20(weth.address)] += msg.value
  log Pay(msg.sender, ERC20(weth.address), msg.value)

@external
def claimRefund(_token: ERC20, _amount: uint256):
  self.pendingRefund[msg.sender][_token] -= _amount
  assert _token.transfer(msg.sender, _amount), "tfr"
  log ClaimRefund(msg.sender, _token, _amount)

[{"name":"SetAdmin","inputs":[{"name":"old","type":"address","indexed":true},{"name":"new","type":"address","indexed":true}],"anonymous":false,"type":"event"},{"name":"SetToken","inputs":[{"name":"token","type":"address","indexed":true},{"name":"accepted","type":"bool","indexed":true}],"anonymous":false,"type":"event"},{"name":"Withdraw","inputs":[{"name":"token","type":"address","indexed":true},{"name":"amount","type":"uint256","indexed":true}],"anonymous":false,"type":"event"},{"name":"Charge","inputs":[{"name":"user","type":"address","indexed":true},{"name":"token","type":"address","indexed":true},{"name":"amount","type":"uint256","indexed":true}],"anonymous":false,"type":"event"},{"name":"Refund","inputs":[{"name":"user","type":"address","indexed":true},{"name":"token","type":"address","indexed":true},{"name":"amount","type":"uint256","indexed":true}],"anonymous":false,"type":"event"},{"name":"Pay","inputs":[{"name":"user","type":"address","indexed":true},{"name":"token","type":"address","indexed":true},{"name":"amount","type":"uint256","indexed":true}],"anonymous":false,"type":"event"},{"name":"ClaimRefund","inputs":[{"name":"user","type":"address","indexed":true},{"name":"token","type":"address","indexed":true},{"name":"amount","type":"uint256","indexed":true}],"anonymous":false,"type":"event"},{"stateMutability":"nonpayable","type":"constructor","inputs":[{"name":"_weth","type":"address"}],"outputs":[]},{"stateMutability":"nonpayable","type":"function","name":"setAdmin","inputs":[{"name":"_newAdmin","type":"address"}],"outputs":[]},{"stateMutability":"nonpayable","type":"function","name":"setToken","inputs":[{"name":"_token","type":"address"},{"name":"_accepted","type":"bool"}],"outputs":[]},{"stateMutability":"nonpayable","type":"function","name":"withdraw","inputs":[{"name":"_token","type":"address"},{"name":"_amount","type":"uint256"}],"outputs":[]},{"stateMutability":"nonpayable","type":"function","name":"charge","inputs":[{"name":"_user","type":"address"},{"name":"_token","type":"address"},{"name":"_amount","type":"uint256"}],"outputs":[]},{"stateMutability":"nonpayable","type":"function","name":"refund","inputs":[{"name":"_user","type":"address"},{"name":"_token","type":"address"},{"name":"_amount","type":"uint256"}],"outputs":[]},{"stateMutability":"nonpayable","type":"function","name":"payToken","inputs":[{"name":"_token","type":"address"},{"name":"_amount","type":"uint256"}],"outputs":[]},{"stateMutability":"payable","type":"function","name":"payEther","inputs":[],"outputs":[]},{"stateMutability":"nonpayable","type":"function","name":"claimRefund","inputs":[{"name":"_token","type":"address"},{"name":"_amount","type":"uint256"}],"outputs":[]},{"stateMutability":"view","type":"function","name":"admin","inputs":[],"outputs":[{"name":"","type":"address"}]},{"stateMutability":"view","type":"function","name":"weth","inputs":[],"outputs":[{"name":"","type":"address"}]},{"stateMutability":"view","type":"function","name":"acceptedTokens","inputs":[{"name":"arg0","type":"address"}],"outputs":[{"name":"","type":"bool"}]},{"stateMutability":"view","type":"function","name":"paid","inputs":[{"name":"arg0","type":"address"},{"name":"arg1","type":"address"}],"outputs":[{"name":"","type":"uint256"}]},{"stateMutability":"view","type":"function","name":"charged","inputs":[{"name":"arg0","type":"address"},{"name":"arg1","type":"address"}],"outputs":[{"name":"","type":"uint256"}]},{"stateMutability":"view","type":"function","name":"pendingRefund","inputs":[{"name":"arg0","type":"address"},{"name":"arg1","type":"address"}],"outputs":[{"name":"","type":"uint256"}]}]

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00000000000000000000000094373a4919b3240d86ea41593d5eba789fef3848

-----Decoded View---------------
Arg [0] : _weth (address): 0x94373a4919B3240D86eA41593D5eBa789FEF3848

-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 00000000000000000000000094373a4919b3240d86ea41593d5eba789fef3848