interface IKeep3rJobFundableCredits {
  // Events

  /// @notice Emitted when Keep3rJobFundableCredits#addTokenCreditsToJob is called
  /// @param _job The address of the job being credited
  /// @param _token The address of the token being provided
  /// @param _provider The user that calls the function
  /// @param _amount The amount of credit being added to the job
  event TokenCreditAddition(address indexed _job, address indexed _token, address indexed _provider, uint256 _amount);

  /// @notice Emitted when Keep3rJobFundableCredits#withdrawTokenCreditsFromJob is called
  /// @param _job The address of the job from which the credits are withdrawn
  /// @param _token The credit being withdrawn from the job
  /// @param _receiver The user that receives the tokens
  /// @param _amount The amount of credit withdrawn
  event TokenCreditWithdrawal(address indexed _job, address indexed _token, address indexed _receiver, uint256 _amount);

  // Errors

  /// @notice Throws when the token is KP3R, as it should not be used for direct token payments
  error TokenUnallowed();

  /// @notice Throws when the token withdraw cooldown has not yet passed
  error JobTokenCreditsLocked();

  /// @notice Throws when the user tries to withdraw more tokens than it has
  error InsufficientJobTokenCredits();

  // Variables

  /// @notice Last block where tokens were added to the job [job => token => timestamp]
  /// @return _timestamp The last block where tokens were added to the job
  function jobTokenCreditsAddedAt(address _job, address _token) external view returns (uint256 _timestamp);

  // Methods

  /// @notice Add credit to a job to be paid out for work
  /// @param _job The address of the job being credited
  /// @param _token The address of the token being credited
  /// @param _amount The amount of credit being added
  function addTokenCreditsToJob(
    address _job,
    address _token,
    uint256 _amount
  ) external;

  /// @notice Withdraw credit from a job
  /// @param _job The address of the job from which the credits are withdrawn
  /// @param _token The address of the token being withdrawn
  /// @param _amount The amount of token to be withdrawn
  /// @param _receiver The user that will receive tokens
  function withdrawTokenCreditsFromJob(
    address _job,
    address _token,
    uint256 _amount,
    address _receiver
  ) external;
}
/// @title Keep3rJobFundableCredits contract
/// @notice Handles the addition and withdrawal of credits from a job
function jobTokenCreditsAddedAt(address _job, address _token) external view returns (uint256 _timestamp);

/// @notice Last block where tokens were added to the job [job => token => timestamp]
/// @return _timestamp The last block where tokens were added to the job