binding-provider.cs

public class UserTokenBindingProvider : IBindingProvider
{
    private readonly IServiceProvider _serviceProvider;
    public UserTokenBindingProvider(IServiceProvider serviceProvider)
    {
        _serviceProvider = serviceProvider;
    }
    public Task<IBinding> TryCreateAsync(BindingProviderContext context)
    {
        IBinding binding = new UserTokenBinding(_serviceProvider);
        return Task.FromResult(binding);
    }
}