NIO Custom Stamp Voucher, For Use with NIO 071509 Stamp - NIO voucher code for use with NIO stamps. Visit design.my-nio.com to redeem your code and begin the design process. You'll find hundreds of design templates to choose from online for all of life's occasions. Themes include; love and wedding, celebration and gifts, new or return address, birth and baby, cooking and crafting, and more.