so i am suposed to make api call to fetch data plans from an endpoint url, it returns the complete data in postman which is
{
“status”: true,
“data_plans”: [
{
“id”: 12,
“name”: “MTN CG 500MB”,
“planid”: 7,
“gig_measurment”: 0,
“plan_code”: 106,
“validity”: “30 Days”,
“network”: 1,
“plan_type”: 2
},
{
“id”: 13,
“name”: “MTN CG 1GB”,
“planid”: 8,
“gig_measurment”: 1,
“plan_code”: 107,
“validity”: “30 Days”,
“network”: 1,
“plan_type”: 2
},
{
“id”: 14,
“name”: “MTN CG 2GB”,
“planid”: 9,
“gig_measurment”: 2,
“plan_code”: 108,
“validity”: “30 Days”,
“network”: 1,
“plan_type”: 2
},
{
“id”: 15,
“name”: “MTN CG 3GB”,
“planid”: 10,
“gig_measurment”: 3,
“plan_code”: 109,
“validity”: “30 Days”,
“network”: 1,
“plan_type”: 2
},
{
“id”: 16,
“name”: “MTN CG 5GB”,
“planid”: 11,
“gig_measurment”: 5,
“plan_code”: 110,
“validity”: “30 Days”,
“network”: 1,
“plan_type”: 2
},
{
“id”: 17,
“name”: “MTN CG 10GB”,
“planid”: 12,
“gig_measurment”: 10,
“plan_code”: 111,
“validity”: “30 Days”,
“network”: 1,
“plan_type”: 2
}
]
}

instead this is what i get as response in my flutter app
Response data: {status: true, data_plans: []}

`

Future<void> fetchDataPlans() async {
  final url = 'https://yourapi.com/getdataplans/';
  final requestPayload = {
    'network': selectedNetwork.toString(),
    'selectedPlanType': '2',
  };

  debugPrint('Fetching data plans with payload: $requestPayload');

  try {
    final response = await http.post(
      Uri.parse(url),
      headers: {
        'Content-Type': 'application/json',
      },
      body: jsonEncode(requestPayload),
    );

    debugPrint('Response status: ${response.statusCode}');
    debugPrint('Response body: ${response.body}');

    if (response.statusCode == 200) {
      final dynamic responseData = jsonDecode(response.body);
      debugPrint('Response data: $responseData');

      List<Map<String, dynamic>> plans;
      if (responseData is Map && responseData['status'] == true && responseData['data_plans'] is List) {
        plans = List<Map<String, dynamic>>.from(responseData['data_plans']);
      } else {
        throw Exception('Unexpected response format');
      }

      debugPrint('Parsed data plans: $plans');

      setState(() {
        dataPlans = plans;
        selectedDataPlan = plans.isNotEmpty ? plans.first['plan_code'].toString() : '';
      });
    } else {
      throw Exception('Failed to load data plans');
    }
  } catch (e) {
    debugPrint('Error fetching data plans: $e');
  }
}