public async Task <ValidateProductCategoriesResponse> Validate(ValidateProductCategoriesRequest request)
{
var pairs = request.Pairs
.Select(p => _convertService.Convert <ProductAndCategoryPairContract, ProductAndCategoryPair>(p))
.ToList();
var errorMessages = await _productCategoriesService.Validate(pairs);
var response = new ValidateProductCategoriesResponse()
{
ErrorMessages = errorMessages,
};
return(response);
}