Segment by Product Category, Product name, Product SKU, Product prices

I use this pattern. 

```
?module=API&method=Goals.getItemsName 
&idSite=1 
&period=day 
&date=today 
&format=JSON 
&token_auth=xxxxxx 
&segment=ProductCategory==electronic 
```

See the bold text, I try to use the segment to filter ProductCategory in ecomerce but fail. 

Thanks a lot.
Keywords: ecommerce
