Clearly bind options for library code

BindOptionsForLibraryDesign.md

• NuGet packages:

  <PackageReference Include="Microsoft.Extensions.Configuration.Abstractions" Version="7.0.0" />
  <PackageReference Include="Microsoft.Extensions.Configuration.Binder" Version="7.0.2" />

• Code

  public static IServiceCollection AddYourExtensionMethodName(this IServiceCollection services, string optionSectionName = "OPIOptions")
  {
      services.AddOptions<OPIClientOptions>().Configure<IConfiguration>((opt, configuration) =>
      {
          configuration.GetSection(optionSectionName).Bind(opt);
      });
  ...
      return services;
  }

Consider using BindConfiguration extension method.
Namespace: Microsoft.Extensions.DependencyInjection
Package: Microsoft.Extensions.Options.ConfigurationExtensions.

It looks like the code could then be simplified:

public static IServiceCollection AddYourExtensionMethodName(this IServiceCollection services, string optionSectionName = "OPIOptions")
{
    services.AddOptions<OPIClientOptions>().BindConfiguration(optionSectionName);
...
    return services;
}