Using Gameon from Alexa via Javascript

So, I got Gameon working via Javascript and also for an Alexa Skill, the basic part of the REST requests was easy after I figured out the signing code. Copy/Pasting the following parts of some NodeJS code that may be helpful, I am sure there are better ways/RSA modules to use than the ones used below. Hope this helps someone.

const request = require('request');
const crypto = require("crypto");
const RSAKey = require('rsa-key');

// Encrypt the client public key using the game's public key
function getEncryptedPayload() {

    /* Import the key in any format*/
    var key = new RSAKey(GAME_PUBLIC_KEY);   
    /* Export key in default format (PEM PKCS8) */
    var pemKey = key.exportKey();

    let buffer = new Buffer(CLIENT_PUBLIC_KEY);
    let encrypted = crypto.publicEncrypt({key: pemKey, padding: crypto.constants.RSA_PKCS1_PADDING}, buffer);

    let encryptedPayload = encrypted.toString("base64");
    return encryptedPayload;
}

// Now decrypt the player token using the client private key
function decryptPlayerToken(encryptedPlayerToken) {

    let privateKey = new RSAKey(CLIENT_PRIVATE_KEY);
    let privatePemKey = privateKey.exportKey();

    let newBuffer = new Buffer(encryptedPlayerToken, "base64");

    let decryptedPlayerToken = crypto.privateDecrypt({key: privatePemKey, padding: crypto.constants.RSA_PKCS1_PADDING}, newBuffer);
    let playerToken = decryptedPlayerToken.toString();

    return playerToken;
}

// Now encrypt the player token using the game's public key
function encryptPlayerToken(playerToken) {
    /* Import the key in any format*/
    var key = new RSAKey(GAME_PUBLIC_KEY);   
    /* Export key in default format (PEM PKCS8) */
    var pemKey = key.exportKey();

    let buffer = new Buffer(playerToken);
    let encrypted = crypto.publicEncrypt({key: pemKey, padding: crypto.constants.RSA_PKCS1_PADDING}, buffer);

    let encryptedPayload = encrypted.toString("base64");
    return encryptedPayload;
}

exports.adminRegisterPlayer = function adminRegisterPlayer(options, callback) {
    let vendorPlayerId = options.playerId || "";  // Pass in your id for the player here
    let encryptedPayload = getEncryptedPayload();

    let uri = "/players/register";
    let requestUrl = "https://admin-api.amazongameon.com/v1" + uri;

    let requestHeaders = {"Content-Type": "application/json",
                            "X-Api-Key": ADMIN_KEY
                            };
    let bodyObj = {
        "advertisingId": "blahblahblah",
        "encryptedPayload": encryptedPayload,
        "vendorPlayerId": vendorPlayerId
    };
                        
    let body = JSON.stringify(bodyObj);

    request.post({url: requestUrl, headers: requestHeaders, body: body}, function(error, response, body) {

        if(error) {
            console.log("Error:");
            console.log(error);
    
            console.log("Response:");
            console.log(response);
    
            console.log("Body:");
            console.log(body);
        }

        let responseObj = JSON.parse(body);

        // Now decrypt the player token
        let playerToken = decryptPlayerToken(responseObj.encryptedPlayerToken);

        if(callback) {
            callback(playerToken, responseObj.externalPlayerId);
        }
    });
    return;
}

exports.authPlayer = function authPlayer(options, callback) {

    let uri = "/players/auth";    
    let requestUrl = "https://api.amazongameon.com/v1" + uri;

    var requestHeaders = {"Content-Type": "application/json",
                            "X-Api-Key": PUBLIC_API_KEY
                            };

    let encryptedPayload = encryptPlayerToken(options.playerToken);

    let bodyObj = {
        "advertisingId": "blahblahblah", // Looks like could be anything
        "appBuildType": "development",
        "deviceOSType": "html",  // Type 'alexa' is not allowed
        "encryptedPayload": encryptedPayload,
        "playerName": "testName"
    };
                        
    let body = JSON.stringify(bodyObj);
                        
    request.post({url: requestUrl, headers: requestHeaders, body: body}, function(error, response, body) {
        if(error) {
            console.log("Error:");
            console.log(error);

            console.log("Response:");
            console.log(response);

            console.log("Body:");
            console.log(body);
        }

        let responseObj = JSON.parse(body);

        if(callback) {
            callback(responseObj);
        }

    });
    return;
}