Running method only once when starting an application in .NET6

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C#

ASP.NET-Core

.NET6

Hello, I'm migrating a .NET Framework 4.8 web API to .NET6. For creating PDFs I'm using an external library called ABCpdf. It needs a license key to work, which should be initialized only once, when the app is starting.

Method which is installing/getting the license:

private void InstallAbcPdfLicense()
  {
      string license = ServiceLocator.Current.GetInstance<IAbcPdfOptions>().AbcPdfLicense;

      if (string.IsNullOrEmpty(license))
      {
          logger.LogWarning("Unable to find the license for the .pdf generator in web.config. Pdf generation will fail.");
      }

      if (!XSettings.InstallLicense(license))
      {
          logger.LogWarning("Unable to install the license for the .pdf generator. Pdf generation will fail. " + XSettings.LicenseDescription ?? string.Empty);
      }
  }

So far, when the app has been running on .NET Framework 4.8, that method was initialized in Global.asax file, in Application_Start function:

protected void Application_Start()
      {
          MvcHandler.DisableMvcResponseHeader = true;
          InitializeViewEngine();
          InitAppInsights();
          InitWhitelistedIps();
          InstallAbcPdfLicense();
          SetMinThreads();
      }

And it worked fine. But now that I have to move everything to Startup.cs file, I have a question what is the best solution to make sure that it is executed only once, when the app starts?

What I have tried:

So far the best solution I have came up with is initializing the
InstallAbcPdfLicense in Startup file's Configure method by using lifetime

public void Configure(IApplicationBuilder app, IWebHostEnvironment env, IUrlRewriteService urlRewriteService, IHostApplicationLifetime lifetime)
{
  //other methods
  lifetime.ApplicationStarted.Register(InstallAbcPdfLicense);
}

But is there better approach?