GooglePayButton when clicked does not show the sheet to fill or choose payment details.
In the Console getting this when button clicked:
Console

I am using pay: ^2.0.0 to make use of gpay. The code for gpay button is:

FutureBuilder<PaymentConfiguration>(
    future: _googlePayConfigFuture,
                                builder: (context, snapshot) => snapshot.hasData
         ? GooglePayButton(
      paymentConfiguration: snapshot.data!,
      paymentItems: paymentItems,
      type: GooglePayButtonType.pay,
      theme: GooglePayButtonTheme.light,
      width: double.maxFinite,
      margin: const EdgeInsets.only(top: 15.0),
      onPaymentResult: (data){
        print(data);
      },
      loadingIndicator: const Center(
        child: CircularProgressIndicator(),
      ),
     )
        : const SizedBox.shrink()),

_googlePayConfigFuture used in paymentConfiguration:

late final Future<PaymentConfiguration> _googlePayConfigFuture;
@override
void initState() {
    paymentItems.add(PaymentItem(amount: '${retrievePaymentAmount}', label: "Bin", status: PaymentItemStatus.final_price));
    super.initState();
    _googlePayConfigFuture =
        PaymentConfiguration.fromAsset('gpay.json');
  }

Here is gpay.json file which is in assets.

{
  "provider": "google_pay",
  "data": {
    "environment": "TEST",
    "apiVersion": 2,
    "apiVersionMinor": 0,
    "allowedPaymentMethods": [{
      "type": "CARD",
      "tokenizationSpecification": {
        "type": "PAYMENT_GATEWAY",
        "parameters": {
          "gateway": "example",
          "gatewayMerchantId": "gatewayMerchantId"
        }
      },
      "parameters": {
        "allowedCardNetworks": ["VISA", "MASTERCARD"],
        "allowedAuthMethods": ["PAN_ONLY", "CRYPTOGRAM_3DS"],
        "billingAddressRequired": true,
        "billingAddressParameters": {
          "format": "FULL",
          "phoneNumberRequired": true
        }
      }
    }],
    "merchantInfo": {
      "merchantId": "01234567890123456789",
      "merchantName": "Example Merchant Name"
    },
    "transactionInfo": {
      "countryCode": "US",
      "currencyCode": "USD"
    }
  }
}