postAndParseJson method
Implementation
Future<Map<String, dynamic>> postAndParseJson(String url, String body,
String apiKey, {String? authToken, String? requestHash}) async {
final String res = await post(url, body, apiKey, authToken: authToken, requestHash: requestHash);
final Map<String, dynamic> jsonBody =
Map<String, dynamic>.from(json.decode(res));
return jsonBody;
}