Sending and Requesting Data from MongoDB in a Unity Game

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using UnityEngine;
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public class PlayerData
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{
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    public string plummie_tag;
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    public int collisions;
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    public int steps;
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}

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using UnityEngine;
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public class PlayerData
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{
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    // 'public' variables here ...
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    public string Stringify() 
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    {
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        return JsonUtility.ToJson(this);
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    }
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    public static PlayerData Parse(string json)
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    {
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        return JsonUtility.FromJson<PlayerData>(json);
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    }
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}

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using UnityEngine;
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using System.Text;
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using UnityEngine.Networking;
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using System.Collections;
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public class Player : MonoBehaviour
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{
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    public float speed = 1.5f;
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    private Rigidbody2D _rigidBody2D;
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    private Vector2 _movement;
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    void Start()
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    {
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        _rigidBody2D = GetComponent<Rigidbody2D>();
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    }
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    void Update()
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    {
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        // Mouse and keyboard input logic here ...
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    }
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    void FixedUpdate() {
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        // Physics related updates here ...
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    }
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}

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using System.Text;
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using UnityEngine.Networking;

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using UnityEngine;
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using System.Text;
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using UnityEngine.Networking;
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using System.Collections;
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public class Player : MonoBehaviour
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{
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    public float speed = 1.5f;
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    private Rigidbody2D _rigidBody2D;
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    private Vector2 _movement;
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    private PlayerData _playerData;
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    void Start()
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    {
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        _rigidBody2D = GetComponent<Rigidbody2D>();
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        _playerData = new PlayerData();
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        _playerData.plummie_tag = "nraboy";
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    }
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    void Update() { }
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    void FixedUpdate() { }
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    void OnCollisionEnter2D(Collision2D collision) 
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    {
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        _playerData.collisions++;
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    }
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}

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IEnumerator Download(string id, System.Action<PlayerData> callback = null)
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{
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    using (UnityWebRequest request = UnityWebRequest.Get("http://localhost:3000/plummies/" + id))
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    {
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        yield return request.SendWebRequest();
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        if (request.isNetworkError || request.isHttpError)
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        {
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            Debug.Log(request.error);
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            if (callback != null)
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            {
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                callback.Invoke(null);
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            }
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        }
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        else
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        {
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            if (callback != null)
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            {
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                callback.Invoke(PlayerData.Parse(request.downloadHandler.text));
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            }
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        }
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    }
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}

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IEnumerator Upload(string profile, System.Action<bool> callback = null)
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{
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    using (UnityWebRequest request = new UnityWebRequest("http://localhost:3000/plummies", "POST"))
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    {
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        request.SetRequestHeader("Content-Type", "application/json");
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        byte[] bodyRaw = Encoding.UTF8.GetBytes(profile);
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        request.uploadHandler = new UploadHandlerRaw(bodyRaw);
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        request.downloadHandler = new DownloadHandlerBuffer();
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        yield return request.SendWebRequest();
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        if (request.isNetworkError || request.isHttpError)
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        {
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            Debug.Log(request.error);
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            if(callback != null) 
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            {
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                callback.Invoke(false);
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            }
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        }
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        else
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        {
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            if(callback != null) 
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            {
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                callback.Invoke(request.downloadHandler.text != "{}");
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            }
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        }
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    }
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}

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void Start()
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{
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    _rigidBody2D = GetComponent<Rigidbody2D>();
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    _playerData = new PlayerData();
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    _playerData.plummie_tag = "nraboy";
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    StartCoroutine(Download(_playerData.plummie_tag, result => {
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        Debug.Log(result);
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    }));
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}

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void FixedUpdate() 
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{
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    // Movement logic here ...
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    if(_rigidBody2D.position.x > 24.0f) {
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        StartCoroutine(Upload(_playerData.Stringify(), result => {
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            Debug.Log(result);
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        }));
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    }
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}

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private bool _isGameOver;

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void Start()
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{
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    // Previous code here ...
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    _isGameOver = false;
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}

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void FixedUpdate() 
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{
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    // Movement logic here ...
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    if(_rigidBody2D.position.x > 24.0f && _isGameOver == false) {
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        StartCoroutine(Upload(_playerData.Stringify(), result => {
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            Debug.Log(result);
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        }));
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        _isGameOver = true;
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    }
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}