private static string GetOauth2AuthenticationHeader(Dictionary <AuthenticationType, string> accessTokens, AuthenticationType authenticationType) { string authHeader; if (accessTokens.ContainsKey(authenticationType)) { accessTokens.TryGetValue(authenticationType, out var value); authHeader = $" -H \"Authorization: Bearer {value}\""; } else { throw new QAToolKitBombardierException($"One of the access token is missing (AuthenticationType {authenticationType.Value()} required)."); } return(authHeader); }