APIConsumer.sol

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.6;

import "@chainlink/contracts/src/v0.6/ChainlinkClient.sol";

contract APIConsumer is ChainlinkClient {


uint256 public _endOdometer;
uint256 public OdometerDecimal;

address private link;
address private oracle;
bytes32 private jobId;
uint256 private fee;

/**
 * Network: Kovan
 * Kovan link address = 0xa36085F69e2889c224210F603D836748e7dC0088
 */
constructor() public {
    link = 0xa36085F69e2889c224210F603D836748e7dC0088;
    if (link == address(0)) {
        setPublicChainlinkToken();
    } else {
        setChainlinkToken(link);
    }
    // oracle = 0x7caBbcCAa965F3466387C001c3154BD69cA26AF5;
    // jobId = "b2779045343f4d21879c33d1d95dca36";
    // fee = 0
    oracle = 0x7caBbcCAa965F3466387C001c3154BD69cA26AF5;
    jobId = stringToBytes32("b2779045343f4d21879c33d1d95dca36");
    fee = 0;
}

function requestVolumeData(string memory _vehicleId, string memory _encToken) public returns (bytes32 requestId) 
{
    Chainlink.Request memory request = buildChainlinkRequest(jobId, address(this), this.fulfill.selector);
    request.add("vehicleId", _vehicleId);
    request.add("encToken", _encToken);

    
    // Sends the request
    return sendChainlinkRequestTo(oracle, request, fee);
}

/**
 * Receive the response in the form of uint256
 */ 
function fulfill(bytes32 _requestId, uint256 _distance) public recordChainlinkFulfillment(_requestId)
{
    _endOdometer = _distance/1000;
    OdometerDecimal = _distance%1000;
}

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

    assembly {
        result := mload(add(source, 32))
    }
}
}