Exclude ISBN items from eBay

This script will exclude any items that have ISBNs from being sent to eBay.

if( marketplace == 'EBay' )
{
  if (item.idtype == 2) return 0; 
}

You can change the item.idtype to a different number if you wish to exclude a different type of item. These are the options:

1 = ASIN
2 = ISBN
3 = UPC
4 = EAN