You receive from GS1 only the first 12 figures of your UPC/EAN numbers, for the 13th number, the so called check-digit number, as well as the barcode images you must contact external service suppliers like EANnummer.com.
The use of the UPC/EAN numbers from GS1 can generate a huge potential risque for your company if you use these numbers to identify production processes, product recipes, storage layouts, staff and visitors identifiers, safety key locations, etc, etc. because they are public information for other GS1 members.
You loose your GS1 numbers if you stop paying your high yearly GS1 membership fees.
The UPC/EAN codes of EANnummer.com are really unique, they will never recycled, no yearly fee, they stay private as long as you wish and you own them till the end of time.