cancelInvoice method

Implementation

Future<void> cancelInvoice({String? transactionNo}) async {
  try {
    if (transactionNo == null) {
      throw ArgumentError('Transaction number cannot be null.');
    }

    if (paymentToken == null) await _authenticate();

    /// Request body parameters
    Map<String, dynamic> requestBody = {
      'transactionNo': transactionNo,
    };

    final response = await http.post(
      Uri.parse('$apiLink/api/cancelInvoice'),
      headers: {
        'accept': '*/*',
        'content-type': 'application/json',
        'Authorization': 'Bearer $paymentToken',
      },
      body: jsonEncode(requestBody),
    );

    if (response.statusCode != 200) {
      throw Exception('Failed to cancel the invoice: ${response.body}');
    }

    Map<String, dynamic> responseBody = json.decode(response.body);

    if (responseBody.isEmpty || responseBody['success'] != 'true') {
      throw Exception('Failed to cancel the invoice: ${response.body}');
    }
  } catch (e) {
    rethrow;
  }
}