rsoauth

    // NODE_AUTH https://github.com/ciaranj/node-oauth

   var body = {  "user_id": 5456680,
                "first_name": "Tommie",
                "last_name": "McAfee",
                "email": "contact@phikay.com",
                "address1": "2384 Beal",
                "city": "Omahah",
                "state": "NE",
                "country_code": "US",
                "zipcode": "47544",
                "phone": "555-555-1234",
                "dob": "1971-05-09",
                "gender": "M",
                "events": [
                    {  "event_id": 42801,
                        "giveaway_option_id": 272454                } ]
            } ],
        "waiver_accepted": "T"
    }

    
var oauth = new OAuth.OAuth(
        'https://runsignup.com/oauth/requestToken.php',
        'https://runsignup.com/oauth/accessToken.php',
        oauth_key,  
        oauth_secret,
        '1.0A',
        null,
        'HMAC-SHA1'
);
    
    
oauth.post(
    "https://runsignup.com/Rest/race/15728/registration?action=get-cart&format=json",
    api_key, api_secret,
    {"request_format": "json", "request": JSON.stringify(body)},
    function(error, data) {
        if(error){/* handle */ }
        done()
    }
)