/// <summary>
/// Add Api Key Header.
/// </summary>
/// <param name="key">Api Key name.</param>
/// <param name="value">Api Key value.</param>
/// <returns></returns>
public void AddApiKey(string key, string value)
{
if (ApiKey.ContainsKey(key))
{
ApiKey.Remove(key);
}
ApiKey.Add(key, value);
}
