Blog-CustomerApiClient

```csharp
public class CustomerApiClient : ICustomerApiClient
{
  private readonly HttpClient _httpClient;
  private readonly CustomerApiClientConfig _config;
  private readonly RequestFactory _requestFactory;

  public CustomerApiClient(HttpClient httpClient, CustomerApiClientConfig config)
  {
    _httpClient = httpClient ?? throw new ArgumentNullException(nameof(httpClient));
    _config = config ?? throw new ArgumentNullException(nameof(config));

    _requestFactory = new RequestFactory(config);
  }

  public async Task<SearchCustomerResponse> SearchAsync(SearchCustomerRequest request, CancellationToken cancellationToken = default)
  {
    try
    {
      var httpRequest = _requestFactory.Create(request, _config.SearchCustomerUri);
  
      var httpResponse = await _httpClient.SendAsync(httpRequest, cancellationToken);
  
      return await ResponseHandler.HandleAsync<SearchCustomerResponse>(httpResponse);
    }
    catch (Exception ex)
    {
      throw new CustomerApiClientException("Error occurred while searching for customer.", ex);
    }
  }

  // ... more methods for API operations
}
```