Are you creating a new listing on Amazon.com? Did you just purchase a whole lot of UPC codes, only to find that you get an error message saying your UPC code is invalid? I am a longtime e-commerce expert (over 10 years of experience) who can help you fix the UPC code and start listing new products on Amazon! This is perfect for those who manufacture your own items through private labeling, handmade, etc.
NOTE: Sometimes your purchased UPC will not work for an already branded item (i.e. Sony, Disney, etc.) product as Amazon sometimes requires a manufacturer authorized UPC code. Unfortunately, I cannot help much on those situations as you provide the UPC to me.
I can also handle larger volumes of UPCs upon request. Message me for details.