ExamleInterface.cs

public class GetProductBySkuHandler : IRequestHandler<GetProductBySkuRequest, ProductViewModel>
{
    private readonly IProductService _productService;

    public GetProductBySkuHandler(IProductService productService)
    {
        _productService = productService;
    }

    public async Task<ProductViewModel> Handle(GetProductBySkuRequest request, CancellationToken cancellationToken)
    {
        var product = await _productService.GetProductBySku(request.Sku);
        return product.ToViewModel();
    }
}