Issue is in displaying card in stripe payment - flutter

Question

I want to intigrate stripe payment but i got this error
Instance of 'StripeConfigException
Also my when i click on pay button it is not showing any type of card.
I want to print jsonresponse["emphermalKey"] and jsonresponse["customer"] but these show null value .
Please solve my issue i am stuck in stripe payment for couple of days
Here is my stripe log which shoes null value
{
"customer": null,
"description": null,
"invoice": null,
"last_payment_error": null,
"latest_charge": null,
"next_action": null,
"on_behalf_of": null,
"payment_method": null,
"payment_method_options": {
"card": {
"installments": null,
"mandate_options": null,
"network": null,
"request_three_d_secure": "automatic"
}
"processing": null,
"review": null,
"setup_future_usage": null,
"shipping": null,
"source": null,
"statement_descriptor": null,
"statement_descriptor_suffix": null,
"status": "requires_payment_method",
"transfer_data": null,
"transfer_group": null
}
my code
Center(
child: ElevatedButton(
onPressed: () {
intpayment(email: "email,amount: 50.0);
},
child: Text("Pay20\$"),
),
),
Function
Future<void> intpayment(
{required String email, required double amount})async{
try{
final response= await http.post(Uri.parse("https://api.stripe.com/v1/payment_intents")
,body:{
"receipt_email": email,
"amount": amount.toInt().toString(),
"currency": "usd"
},
headers: {
'Authorization': 'Bearer ' + 'key',
'Content-Type': 'application/x-www-form-urlencoded'
}
);
final jsonresponse=jsonDecode(response.body); Stripe.instance.initPaymentSheet(paymentSheetParameters: SetupPaymentSheetParameters(
paymentIntentClientSecret: jsonresponse['paymentIntent'],
merchantDisplayName: 'Zohaib',
customerId: jsonresponse['customer'],
customerEphemeralKeySecret: jsonresponse['ephemeralKey'],
));
await Stripe.instance.presentPaymentSheet();
Fluttertoast.showToast(
msg: "payment successfully",
);
}
catch(e){
if (e is StripeException) {
Fluttertoast.showToast(
msg: "Stripe error $e",
);
}
Fluttertoast.showToast(
msg: "$e",
toastLength: Toast.LENGTH_SHORT, );
}
}