Rinkeby Random Number Consumer: Deploy with https://remix.ethereum.org/#version=soljson-v0.6.12+commit.27d51765.js&optimize=false&runs=200&gist=4d915a385211193967ec28cb883f4445

RandomNumberConsumer.sol

pragma solidity 0.6.6;

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

/**
 * THIS IS AN EXAMPLE CONTRACT WHICH USES HARDCODED VALUES FOR CLARITY.
 * PLEASE DO NOT USE THIS CODE IN PRODUCTION.
 */
contract RandomNumberConsumer is VRFConsumerBase {
    
    bytes32 internal keyHash;
    uint256 internal fee;
    
    uint256 public randomResult;
    bytes32 public reqId;
    
    /**
     * Constructor inherits VRFConsumerBase
     * 
     * Network: Rinkeby
     * Chainlink VRF Coordinator address: 0xb3dCcb4Cf7a26f6cf6B120Cf5A73875B7BBc655B
     * LINK token address:                0x01be23585060835e02b77ef475b0cc51aa1e0709
     * Key Hash: 0x2ed0feb3e7fd2022120aa84fab1945545a9f2ffc9076fd6156fa96eaff4c1311
     */
    constructor() 
        VRFConsumerBase(
            0xb3dCcb4Cf7a26f6cf6B120Cf5A73875B7BBc655B, // VRF Coordinator
            0x01BE23585060835E02B77ef475b0Cc51aA1e0709  // LINK Token
        ) public
    {
        keyHash = 0x2ed0feb3e7fd2022120aa84fab1945545a9f2ffc9076fd6156fa96eaff4c1311;
        fee = 0.1 * 10 ** 18; // 0.1 LINK (Varies by network)
    }
    
    /** 
     * Requests randomness from a user-provided seed
     */
    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;
        reqId = requestId;
    }

    // function withdrawLink() external {} - Implement a withdraw function to avoid locking your LINK in the contract
}