/// <summary>
        /// Asynchronously creates a <see cref="AdGroupBidModifierServiceClient"/>, applying defaults for all unspecified settings,
        /// and creating a channel connecting to the given endpoint with application default credentials where
        /// necessary. See the example for how to use custom credentials.
        /// </summary>
        /// <example>
        /// This sample shows how to create a client using default credentials:
        /// <code>
        /// using Google.Ads.GoogleAds.V0.Services;
        /// ...
        /// // When running on Google Cloud Platform this will use the project Compute Credential.
        /// // Or set the GOOGLE_APPLICATION_CREDENTIALS environment variable to the path of a JSON
        /// // credential file to use that credential.
        /// AdGroupBidModifierServiceClient client = await AdGroupBidModifierServiceClient.CreateAsync();
        /// </code>
        /// This sample shows how to create a client using credentials loaded from a JSON file:
        /// <code>
        /// using Google.Ads.GoogleAds.V0.Services;
        /// using Google.Apis.Auth.OAuth2;
        /// using Grpc.Auth;
        /// using Grpc.Core;
        /// ...
        /// GoogleCredential cred = GoogleCredential.FromFile("/path/to/credentials.json");
        /// Channel channel = new Channel(
        ///     AdGroupBidModifierServiceClient.DefaultEndpoint.Host, AdGroupBidModifierServiceClient.DefaultEndpoint.Port, cred.ToChannelCredentials());
        /// AdGroupBidModifierServiceClient client = AdGroupBidModifierServiceClient.Create(channel);
        /// ...
        /// // Shutdown the channel when it is no longer required.
        /// await channel.ShutdownAsync();
        /// </code>
        /// </example>
        /// <param name="endpoint">Optional <see cref="gaxgrpc::ServiceEndpoint"/>.</param>
        /// <param name="settings">Optional <see cref="AdGroupBidModifierServiceSettings"/>.</param>
        /// <returns>The task representing the created <see cref="AdGroupBidModifierServiceClient"/>.</returns>
        public static async stt::Task <AdGroupBidModifierServiceClient> CreateAsync(gaxgrpc::ServiceEndpoint endpoint = null, AdGroupBidModifierServiceSettings settings = null)
        {
            grpccore::Channel channel = await s_channelPool.GetChannelAsync(endpoint ?? DefaultEndpoint).ConfigureAwait(false);

            return(Create(channel, settings));
        }