RandomNumberConsumer.sol url: https://remix.ethereum.org/#version=soljson-v0.6.6+commit.6c089d02.js&optimize=false&evmVersion=null&gist=536123b71478ad4442cfc4278e8de577

RandomNumberConsumer.sol

// This example code is designed to quickly deploy an example contract using Remix.

pragma solidity 0.6.6;

import "https://raw.githubusercontent.com/smartcontractkit/chainlink/master/evm-contracts/src/v0.6/VRFConsumerBase.sol";

contract RandomNumberConsumer is VRFConsumerBase {
    
    bytes32 internal keyHash;
    uint256 internal fee;
    
    uint256 public randomResult;
    
    /**
     * Constructor inherits VRFConsumerBase
     * 
     * Network: Kovan
     * Chainlink VRF Coordinator address: 0xdD3782915140c8f3b190B5D67eAc6dc5760C46E9
     * LINK token address:                0xa36085F69e2889c224210F603D836748e7dC0088
     * Key Hash: 0x6c3699283bda56ad74f6b855546325b68d482e983852a7a82979cc4807b641f4
     */
    constructor() 
        VRFConsumerBase(
            0xdD3782915140c8f3b190B5D67eAc6dc5760C46E9, // VRF Coordinator
            0xa36085F69e2889c224210F603D836748e7dC0088  // LINK Token
        ) public
    {
        keyHash = 0x6c3699283bda56ad74f6b855546325b68d482e983852a7a82979cc4807b641f4;
        fee = 0.1 * 10 ** 18; // 0.1 LINK
    }
    
    /** 
     * Requests randomness from a user-provided seed
     ************************************************************************************
     *                                    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 getRandomNumber(uint256 userProvidedSeed) public returns (bytes32 requestId) {
        require(LINK.balanceOf(address(this)) >= fee, "Not enough LINK - fill contract with faucet");
        return requestRandomness(keyHash, fee, userProvidedSeed);
    }

    /**
     * Callback function used by VRF Coordinator
     */
    function fulfillRandomness(bytes32 requestId, uint256 randomness) internal override {
        randomResult = randomness;
    }
    
    /**
     * Withdraw LINK from this contract
     * 
     * DO NOT USE THIS IN PRODUCTION AS IT CAN BE CALLED BY ANY ADDRESS.
     * THIS IS PURELY FOR EXAMPLE PURPOSES.
     */
    function withdrawLink() external {
        require(LINK.transfer(msg.sender, LINK.balanceOf(address(this))), "Unable to transfer");
    }
}