1. The field says the code is invalid
Re-type it by hand. Copy-paste from some apps — especially messaging apps and PDFs —
adds an invisible trailing space or swaps in a lookalike character, which checkouts read as
a different code. Clear the field and type adam20 character
by character: a-d-a-m-2-0, all lowercase. This one fix resolves more “invalid
code” errors than everything else combined.
2. Another discount is already on the order
Remove it first. Most checkouts take one code per order, and some apply a promotion
automatically without making it obvious. Check the order summary for any existing discount
line, remove it, then apply adam20 on its own. If you’re
choosing between two codes, apply each separately and keep the better total.
3. The code applies but the total barely moves
Check item eligibility. Some products or add-ons may be excluded from promo pricing, so the code only discounts part of the cart. The discount line tells you exactly what the code covered. This isn’t a broken code — it’s the code working within its terms.
4. Checkout behaves oddly or the field is missing
Start a fresh session. Open a new private/incognito window, rebuild the cart from scratch, and apply the code before anything else at checkout. Stale sessions, half-loaded pages, and aggressive browser extensions (especially other coupon extensions) cause more promo failures than expired codes do. On mobile, also check that the field isn’t just collapsed — see the redemption walkthrough.
5. None of the above worked
The terms may have changed. Promo terms are set by GoodLabs and can shift without
notice — eligibility windows, first-order-only rules, product exclusions. This site is
re-verified monthly; if adam20 is ever retired, the
replacement code is posted on the home page the same week.
How to tell whether it’s the code or the checkout
A quick diagnostic: does the error appear instantly or after a delay? An instant “invalid code” usually means the text in the field is wrong — fix #1. A delayed or generic error usually means the session is confused — fix #4. And a code that applies but disappoints means terms, not typos — fixes #2 and #3.
What’s almost never the answer: hunting for a different code on a coupon aggregator. Scraped coupon lists are where expired codes go to collect clicks — the disclosure page explains why those lists stay stale.
Fixed it? Finish the checkout.
Apply adam20 and confirm the discount line before you pay.