/// <summary>
/// Generate autorization header for POST methods.
/// </summary>
/// <param name="POSTDataToSend">Json object with data to send in query.</param>
/// <returns>Dictonar, key is param name, value is value of this param.</returns>
public Dictionary <string, string> AddOwnHeaderPOST(object POSTDataToSend)
{
string JsonSerializedObject = Serialize.AsJson(POSTDataToSend);
string hash = GenerateHash(config.PublicKey, unixTS, JsonSerializedObject);
return(AddAutorizationHeader(hash));
}