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108function fulfill(
109    bytes32 _agreementId,
110    bytes32 _did,
111    address payable _rewardAddress,
112    address _tokenAddress,
113    uint256[] memory _amounts,
114    address[] memory _receivers
115)
116external
117payable
118returns (ConditionStoreLibrary.ConditionState)
119{
120    require(
121        _amounts.length == _receivers.length,
122        'Amounts and Receivers arguments have wrong length'
123    );
124
125    require(
126        didRegistry.areRoyaltiesValid(_did, _amounts, _receivers),
127        'Royalties are not satisfied'
128    );
129
130    if (_tokenAddress != address(0))
131        require(
132            _transferERC20(_rewardAddress, _tokenAddress, calculateTotalAmount(_amounts)),
133            'Could not transfer token'
134        );
135    else
136        _transferETH(_rewardAddress, calculateTotalAmount(_amounts));
137
138    bytes32 _id = generateId(
139        _agreementId,
140        hashValues(_did, _rewardAddress, _tokenAddress, _amounts, _receivers)
141    );
142    ConditionStoreLibrary.ConditionState state = super.fulfill(
143        _id,
144        ConditionStoreLibrary.ConditionState.Fulfilled
145    );
146
147    emit Fulfilled(
148        _agreementId, 
149        _did,
150        _id,
151        _rewardAddress,
152        _tokenAddress,
153        _receivers, 
154        _amounts
155    );
156    return state;
157}