A coupon code is a special combination of letters, numbers, or both, that you can use when making a purchase online to get a discount or special offer. Full definition
If you need ideas how to use coupon codes for marketing your eBook: you can find tips and examples here! (xinxii.com)
The following are some of the breastfeeding books available for the 20 % discount with coupon code and for bulk order discounts. (texasbreastfeedingcoalition.org)