The code represents a “one time use only” coupon, and cannot be extended over two or more transactions. In other words, it’s a good idea to try and use the entire amount of the discount amount when shopping.
The coupon cannot be transferred to another eBay ID; it can only be used by the ID to which it is assigned.
If you have further questions about your Stores coupon, you can contact eBay Customer Support at 1-866-540-3229. As always, thanks for selling on eBay.