Paypal Native Checkout Button keeps loading and then disappears on Android

I’m using the new Native Checkout SDK for Android with Java and I’ve been following every step in the documentation but this keeps happening and I don’t know why

This is on my public class app extends Application

        CheckoutConfig checkoutConfig = new CheckoutConfig(
            this,
            ID,
            Environment.SANDBOX,
            String.format("%s://paypalpay", BuildConfig.APPLICATION_ID),
            CurrencyCode.MXN,
            UserAction.PAY_NOW,
            new SettingsConfig(
                    true,
                    false
            )
    );

On my fragment where the button is implemented

payPalButton.setup(
            createOrderActions -> {
                ArrayList purchaseUnits = new ArrayList<>();
                purchaseUnits.add(
                        new PurchaseUnit.Builder()
                                .amount(
                                        new Amount.Builder()
                                                .currencyCode(CurrencyCode.MXN)
                                                .value(amount)
                                                .build()
                                )
                                .build()
                );
                Order order = new Order(
                        OrderIntent.CAPTURE,
                        new AppContext.Builder()
                                .userAction(UserAction.PAY_NOW)
                                .build(),
                        purchaseUnits
                );
                createOrderActions.create(order, (CreateOrderActions.OnOrderCreated) null);
            },
            approval -> approval.getOrderActions().capture(result -> {
                Log.i("CaptureOrder", String.format("CaptureOrderResult: %s", result));
                 }),
            () -> {
                Log.d("OnCancel", "Buyer cancelled the PayPal experience.");
                Snackbar snackbar = Snackbar.make(requireView(), R.string.la_donacion_no_fue_realizada, Snackbar.LENGTH_LONG);
                snackbar.getView().setBackgroundColor(ContextCompat.getColor(requireContext(),android.R.color.holo_red_light));
                snackbar.show();
            },
            errorInfo -> {
                Log.d("OnError", String.format("Error: %s", errorInfo));
                Snackbar snackbar = Snackbar.make(requireView(), R.string.la_donacion_no_fue_realizada, Snackbar.LENGTH_LONG);
                snackbar.getView().setBackgroundColor(ContextCompat.getColor(requireContext(),android.R.color.holo_red_light));
                snackbar.show();
            }

    );

Answer

Just Solved It by adding this line in the extends application file:

 PayPalCheckout.setConfig(checkoutConfig);