public static IApplicationBuilder UseSlackEventVerificationMiddleware(this IApplicationBuilder app,
                                                                       SlackEventVerificationMiddlewareOptions options)
 {
     return(app.UseMiddleware <SlackEventVerificationMiddleware>(Options.Create(options)));
 }
 public SlackEventVerificationMiddleware(RequestDelegate next,
                                         IOptions <SlackEventVerificationMiddlewareOptions> options)
 {
     _options = options.Value;
     _next    = next;
 }