demo.sol

contract mortal{

	address public owner;

	function mortal(){

		owner = msg.sender;

	}

	modifier onlyOwner{
		if (msg.sender != owner){
			throw;
		}else{
			_
		}
	}

	function kill() onlyOwner{

		suicide(owner);
	}
}


contract User is mortal{

	string public userName;

	mapping(address=>Service) public services;

	struct Service{
		bool active;
		uint lastUpdate;
		uint256 debt;
	}

	function User(string _name){

		userName = _name;


	}

	function registerToProvider(address _providerAddress) onlyOwner {

		services[_providerAddress] = Service({
			active: true,
			lastUpdate: now,
			debt: 0
			});

	}

	function setDebt(uint256 _debt){
		if(services[msg.sender].active){
			services[msg.sender].lastUpdate 	= now;
			services[msg.sender].debt 			= _debt;

			}else{
				throw;
			}
	}

	function payToProvider(address _providerAddress){
		_providerAddress.send(services[_providerAddress].debt);

	}


	function unsubscribe(address _providerAddress){
		if(services[_providerAddress].debt == 0){
			services[_providerAddress].active = false;

			}else{
				throw;
			}
	}


}

contract Provider is mortal{

	string public providerName;
	string public description;

	function Provider(
		string _name,
		string _description){

		providerName = _name;
		description  = _description;

	}

	function setDebt(uint256 _debt, address _userAddress){

		User person = User(_userAddress);
		person.setDebt(_debt);

	}


}