techflare staging smart contract example

TechFlareConsumer.sol

// SPDX-License-Identifier: MIT
pragma solidity ^0.6.7;

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

contract TechFlareConsumer is ChainlinkClient {
  
    uint256 public value;
    address private oracle;
    bytes32 private jobId;
    uint256 private fee;
    
    /**
     * Network: Kovan
     * Chainlink - 0x2f90A6D021db21e1B2A077c5a37B3C7E75D15b7e
     * Chainlink - 29fa9aa13bf1468788b7cc4a500a45b8
     * Fee: 0.1 LINK
     */
    constructor() public {
        setPublicChainlinkToken();
        oracle = 0x2f90A6D021db21e1B2A077c5a37B3C7E75D15b7e;
        jobId = "29fa9aa13bf1468788b7cc4a500a45b8";
        fee = 0.1 * 10 ** 18; // 0.1 LINK
    }
    
    /**
     * Create a Chainlink request to retrieve API response, find the target
     * data, then multiply by 1000000000000000000 (to remove decimal places from data).
     ************************************************************************************
     *                                    STOP!                                         * 
     *         THIS FUNCTION WILL FAIL IF THIS CONTRACT DOES NOT OWN LINK               *
     *         ----------------------------------------------------------               *
     *         Learn how to obtain testnet LINK and fund this contract:                 *
     *         ------- https://docs.chain.link/docs/acquire-link --------               *
     *         ---- https://docs.chain.link/docs/fund-your-contract -----               *
     *                                                                                  *
     ************************************************************************************/
    function requestAPIData() public returns (bytes32 requestId) 
    {
        Chainlink.Request memory request = buildChainlinkRequest(jobId, address(this), this.fulfill.selector);
        
        // Set the URL to perform the GET request on
        request.add("get", "https://3t9jjasu58.execute-api.ap-northeast-1.amazonaws.com/Stage/chainlink?n=btc&p=h");
        
        // Set the path to find the desired data in the API response:
        request.add("path", "sma.5");

        // Multiply the result by 1000000000000000000 to remove decimals
        int timesAmount = 10**18;
        request.addInt("times", timesAmount);
        
        // Sends the request
        return sendChainlinkRequestTo(oracle, request, fee);
    }
    
    /**
     * Receive the response in the form of uint256
     */ 
    function fulfill(bytes32 _requestId, uint256 _value) public recordChainlinkFulfillment(_requestId)
    {
        value = _value;
    }
    
    /**
     * Withdraw LINK from this contract
     * 
     * NOTE: DO NOT USE THIS IN PRODUCTION AS IT CAN BE CALLED BY ANY ADDRESS.
     * THIS IS PURELY FOR EXAMPLE PURPOSES ONLY.
     */
    function withdrawLink() external {
        LinkTokenInterface linkToken = LinkTokenInterface(chainlinkTokenAddress());
        require(linkToken.transfer(msg.sender, linkToken.balanceOf(address(this))), "Unable to transfer");
    }
}