callPrivate method
Creates and executes a private user request
Implementation
Future<String> callPrivate(String method, String nonce,
{Map<String, String>? parameters}) {
String path = method.toString();
String postData = _createPostData(nonce, parameters);
String apiSign = _createApiSign(path, postData, nonce);
return _doRequest(URL + path, apiKey, apiSign, postData);
}