    function createIdentityFor(address thisOwner, uint thisToken, string memory uri) public override {
        require(msg.sender == _minter, 'Only minter may create identity');
        require(owners[thisToken] == address(0), 'Token already exists');

        // for getTokenByIndex below, 0 based index so we do it before incrementing numIdentities
        allTokens[numIdentities] = thisToken;

        // increment the number of identities
        numIdentities = numIdentities + 1;

        // two way mapping for enumeration
        ownershipMapIndexToToken[thisOwner][balances[thisOwner]] = thisToken;
        ownershipMapTokenToIndex[thisOwner][thisToken] = balances[thisOwner];

        // set owner of new token
        owners[thisToken] = thisOwner;
        // increment balances for owner
        balances[thisOwner] = balances[thisOwner] + 1;
        uriMap[thisToken] = uri;
        emit Transfer(address(0), thisOwner, thisToken);
        emit IdentityCreated(thisOwner, thisToken);
    }
    function createIdentityFor(address thisOwner, uint thisToken, string memory uri) public override {
        require(msg.sender == _minter, 'Only minter may create identity');
        require(owners[thisToken] == address(0), 'Token already exists');
        require(thisOwner != address(0), 'ERC721: mint to the zero address');

        // for getTokenByIndex below, 0 based index so we do it before incrementing numIdentities
        allTokens[numIdentities] = thisToken;

        // increment the number of identities
        numIdentities = numIdentities + 1;

        // two way mapping for enumeration
        ownershipMapIndexToToken[thisOwner][balances[thisOwner]] = thisToken;
        ownershipMapTokenToIndex[thisOwner][thisToken] = balances[thisOwner];

        // set owner of new token
        owners[thisToken] = thisOwner;
        // increment balances for owner
        balances[thisOwner] = balances[thisOwner] + 1;
        uriMap[thisToken] = uri;
        emit Transfer(address(0), thisOwner, thisToken);
        emit IdentityCreated(thisOwner, thisToken);
    }
