NodeJS Facebook User Feed Subscriptions: Invalid OAuth access token

Am close to tearing my hair out (as a passionate developer, should), so hopefully I can get some help on this one. After reading a bunch of forums and sifting through facebook documentation, here is a log file of trying to make a subscription to user feed's. I really only need to know if the bottom set of API's I am running should work in theory. Here is my log:

*********************************************************
makeRequest - Host: graph.facebook.com - Path: /v2.2/{ app_id }/subscriptions?object=user
*********************************************************
Type: DELETE
*********************************************************
Wed Feb 25 2015 12:52:15 GMT+0000 (UTC) Server is listening on port 81
*********************************************************
makeRequest - Host: graph.facebook.com - Path: /oauth/access_token?client_id={ app_id }&client_secret={ app_secret }&grant_type=client_credentials
*********************************************************
Type: GET
*********************************************************
App Access Token: { app_token }
*********************************************************
makeRequest - Host: graph.facebook.com - Path: /v2.2/{ app_id }/subscriptions?&object=user&fields=feed&callback_url={ uri_encoded_ callback_url }&verify_token={ verify_token }&access_token={ app_token }
*********************************************************
Type: POST
*********************************************************
Success: {"error":{"message":"Invalid OAuth access token.","type":"OAuthException","code":190}}

So here I am first trying to delete any subscriptions currently active, then using the API to get issued a new application access token, and finally to make a new subscription. Here is my function to initialize this whole process:

function subscribe_facebook(http,https) {
    var oauth_obj   = getOauthObj('facebook');

    // First Delete
    var url         = oauth_obj.subscription_url;
    var host        = splitUrl(url,"host");
    var path        = splitUrl(url,"path");

    path += "?object=user";

    makeRequest(http,host,path,80,'DELETE',function(ret){
        // Get App Access Token
        url         = oauth_obj.access_token_url;
        host        = splitUrl(url,"host");
        path        = splitUrl(url,"path");

        path    +=  "?client_id="       +   oauth_obj.app_id;
        path    +=  "&client_secret="   +   oauth_obj.app_secret;
        path    +=  "&grant_type=client_credentials";

        makeRequest(https,host,path,443,'GET',function(ret){
            facebook_app_token = ret.toString().split('|');
            facebook_app_token = facebook_app_token[1];
            consoleLogger("App Access Token: " + facebook_app_token);

            subscribe(https,'facebook',443,'POST',facebook_app_token,myServer);
        });
    });
}

And here is the subscribe function it enters:

function subscribe(http,type,port,method,access_token,myServer) {
    var oauth_obj = getOauthObj(type);
    var sub_post_data = "";
    switch (type) {
        case "facebook":
            sub_post_data = 
                "&object="          +   "user"+
                "&fields="          +   "feed"+
                "&callback_url="    +   encodeURIComponent(myServer + "/" + type) +
                "&verify_token="    +   "*****" +
                "&access_token="    +   access_token
            break;
    }

    var host = splitUrl(oauth_obj.subscription_url,"host");
    var path = splitUrl(oauth_obj.subscription_url,"path");
    path += "?" + sub_post_data;

    makeRequest(http,host,path,port,method,function(ret) {
        consoleLogger("Success: " + ret);
    });
}

Being that the OAuth is invalid, I'm assuming that I'm not passing the right parameters to the oauth API to do this or not - can someone steer me in the right direction?