Print UPC barcode or FNSKU barcode on the packaging?

Do I need to print UPC barcode or FNSKU barcode on the packaging? or is it better to stick label? Would I need any other labels like warning label?

Answer:

If you personally send the items to Amazon’s warehouse, you can place the labels yourself before shipping.You can pay a fee to Amazon and they will take care of it.If your items go from the supplier directly into Amazon’s warehouse, you have to email the FNSKU labels to the supplier and have him print the FNSKU barcodes on the packaging or place FNSKU labels on the boxes.The FNSKU labels have to be placed above the UPC barcodes (if the UPC codes are on there), covering them.