When attempting to use a coupon code during checkout, you may encounter an error message stating "The gift certificate or coupon code is invalid." This can be frustrating, but there are several reasons why this might occur. For international buyers, certain coupon codes may not be applicable due to regional restrictions. Additionally, many promotional offers have a minimum purchase requirement; for instance, the first order discount typically requires a minimum spend of $150. It's also important to note that coupon codes often cannot be combined with other discounts. If you've already received a free shipping offer or a quantity discount, additional coupon codes may not be valid.

Sale items in your cart can also affect coupon usage, as these products are often excluded from further discounts. Similarly, items that are subject to federal or state funding regulations may have restrictions on additional discounts. Certain product categories within our inventory may also be exempt from coupon discounts due to pricing agreements or other policies. Lastly, if you've previously used a discount associated with your email address, you may not be eligible for repeated use of the same or similar promotions.

Unfortunately, the error message itself doesn't provide specific details about why the coupon code isn't working in your particular case. However, we hope this explanation helps clarify some of the common reasons behind coupon code issues. If you continue to experience difficulties or have questions about a specific promotion, we encourage you to reach out to our customer service team for personalized assistance. They can provide more detailed information about your order and any applicable discounts or promotions.