statup.cs

var keyVaultService = new KeyVaultService(new GetCredentialService(Configuration), Configuration);
var tokenSecurityValidator = new JwtSecurityTokenValidator(Configuration, keyVaultService);

services.AddTransient<CryptoService>()
  .AddTransient<JwtTokenService>()
  .AddSingleton<TwitchAuthService>()
  .AddSingleton(p => keyVaultService)
  .AddTransient(p => tokenSecurityValidator)
  .AddSingleton<GetCredentialService>()
  .AddTransient<TwitchApiService>()
  .AddTransient<GetTokensFromHttpRequestService>()
  .AddTransient<ProcessApiResultFilter>();
  
  // add auth middleware
services.AddAuthentication(JwtBearerDefaults.AuthenticationScheme)
  .AddJwtBearer(options =>
  {
    options.RequireHttpsMetadata = false;
    options.SecurityTokenValidators.Add(tokenSecurityValidator);
  });