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ExampleConsumer.sol

pragma solidity 0.4.24;

import "https://github.com/smartcontractkit/chainlink/evm-contracts/src/v0.4/ChainlinkClient.sol";
import "https://github.com/smartcontractkit/chainlink/evm-contracts/src/v0.4/vendor/Ownable.sol";

contract ExampleConsumer is ChainlinkClient, Ownable {
    uint256 constant private ORACLE_PAYMENT = 1 * LINK;

    // Apy standard deviation
    string public ApyStd;
    
    event RequestPoolApyStdFulfilled(
       bytes32 indexed requestId,
       bytes32 indexed apyStd
    );

    constructor() public Ownable() {
      setPublicChainlinkToken();
    }


    // Create request to oracle 
    function RequestPoolApyStd(address _oracle, string _jobId, string _pool, string _range)
      public
      onlyOwner
    {
        Chainlink.Request memory req = buildChainlinkRequest(stringToBytes32(_jobId), this, this.fulfillPoolApyStd.selector);
        req.add("pool", _pool);
        req.add("range", _range);
        sendChainlinkRequestTo(_oracle, req, ORACLE_PAYMENT);
    }

    function fulfillPoolApyStd(bytes32 _requestId, bytes32 _apyStd)
      public
      recordChainlinkFulfillment(_requestId)
    {
      emit RequestPoolApyStdFulfilled(_requestId, _apyStd);
      ApyStd = string(abi.encodePacked(_apyStd));  
    }

  function getChainlinkToken() public view returns (address) {
    return chainlinkTokenAddress();
  }

  function withdrawLink() public onlyOwner {
    LinkTokenInterface link = LinkTokenInterface(chainlinkTokenAddress());
    require(link.transfer(msg.sender, link.balanceOf(address(this))), "Unable to transfer");
  }

  function cancelRequest(
    bytes32 _requestId,
    uint256 _payment,
    bytes4 _callbackFunctionId,
    uint256 _expiration
  )
    public
    onlyOwner
  {
    cancelChainlinkRequest(_requestId, _payment, _callbackFunctionId, _expiration);
  }

  function stringToBytes32(string memory source) private pure returns (bytes32 result) {
    bytes memory tempEmptyStringTest = bytes(source);
    if (tempEmptyStringTest.length == 0) {
      return 0x0;
    }

    assembly { // solhint-disable-line no-inline-assembly
      result := mload(add(source, 32))
    }
  }


}