Paste is a trust boundary
Clipboard managers and “deal” extensions sit between you and the merchant — cashback-extensions-risks-europe-2026, browser-profile-hygiene-cashback-europe-2026. Expiry myths burn time — promo-codes-expiry-explained, coupon-hygiene-europe-2026.
Store app vs extension attribution differs — cashback-store-app-vs-browser-extension-europe-2026. Referral vs coupon lanes — referral-vs-coupon-europe-2026.
Clipboard & tool checklist
If a tool pastes a code you never copied, uninstall it before the next checkout.
- Prefer official merchant codes with visible valid-until dates
- One copy → one paste; clear clipboard on shared PCs
- Disable unknown coupon auto-apply extensions; review permissions
- Separate browser profile for cashback — browser-profile-hygiene-cashback-europe-2026
- Never buy “private code packs” from strangers — secondhand-gift-card-code-scams-europe-2026
- Verify referral links independently — referral-link-safety-2026
When tools still help
Password-manager or OS clipboard history can be fine if locked and not shared. Cashback extensions you trust should show merchant + expiry — not silent rewrite. After a hijack scare: change passwords on shopping accounts, run malware check.
Tonight
Open browser extensions page; remove unknown coupon tools; next checkout use a dated code only. Hub: /guides/coupon-education/. Start: /en/start/.