Google APP and Validation. Fake token?

Question

C++ / C#

I'm trying to validate purchases from Google.
Received Json with the Google API, threw the user into the Google console to be responsible for purchases.
Move on. I made a purchase script, the purchases themselves work, everything is fine. But I need to send the Token and Id of the Google product to a server, where it will check the whole thing and if everything is clear (correct), charge the currency.
The script is next.

public class ReceiptFull
{
    public string store;
    public string transactionId;
    public string payload;
}

public class ReceiptGooglePlay
{
    public string json;
    public string signature;
}

public class PurchaseToken
{
    public string orderId;
    public string packageName;
    public string productId;
    public string purchaseTime;
    public string purchaseState;
    public string purchaseToken;
}


public class HardShopeController : MonoBehaviour
{
    private HardCurrencyController hardCurrencyController;
    [SerializeField]
    PurchaseManager purchaseManager;

    private void Awake()
    {
        hardCurrencyController = FindObjectOfType<HardCurrencyController>();
    }

    private void Start()
    {
        PurchaseManager.OnPurchaseConsumable += PurchaseManager_OnPurchaseConsumable;
    }

    private void PurchaseManager_OnPurchaseConsumable(PurchaseEventArgs args)
    {
        Debug.Log("SUCSED BUY");
        StartCoroutine(BuyHardCurrencyCor(args));
    }

    //private void BuyHardCurrency(PurchaseEventArgs args)
    //{
    //    StartCoroutine(BuyHardCurrencyCor(token, productId));
    //}

    private IEnumerator BuyHardCurrencyCor(PurchaseEventArgs args)
    {

        
        ReceiptFull receiptFull = JsonConvert.DeserializeObject<ReceiptFull>(args.purchasedProduct.receipt);
        Debug.Log("TOKEN : " + args.purchasedProduct.receipt);
        ReceiptGooglePlay receiptGooglePlay = JsonConvert.DeserializeObject<ReceiptGooglePlay>(receiptFull.payload);
        PurchaseToken tokenFull = JsonConvert.DeserializeObject<PurchaseToken>(receiptGooglePlay.json);
        
        string token = tokenFull.purchaseToken;

        Debug.Log("token: " + token);

        string argsId = args.purchasedProduct.definition.id;
        var responce = ServerAPI.Billing.BuyProduct(token, argsId);
        yield return StartCoroutine(responce.WaitUntilComplete());
        

        if(responce.Data != null)
        {
            hardCurrencyController.ShoweVisualHardCurrencyOnServer();
        }
    }
}

So, when debugging the Token Debug.Log("TOKEN : " + args.purchasedProduct.receipt); - this is the TOKEN thing: {"Store":"fake","TransactionID":"6b3c54ef-1893-4b65-848d-b5a05c785da5","Payload":"{ \"this\" : \"is a fake receipt \" }"}
When debugging in Visual Studio, I get Null
What to do, help plz)