Shopping portals let you earn extra points on purchases you were going to make anyway, just by clicking through a portal before you shop. Stacked with a rewards card, one purchase can earn points three ways.

Every major program runs a portal, from AAdvantage eShopping to Rakuten for Amex. Rates run from 1 point per dollar to 10 or more during promotions, and points post after the return window closes.

The stack works like this: portal points plus credit card points plus a store sale. A 200-dollar purchase at 5 points per dollar plus a 2x card earns 1,400 points in one transaction.

Tracking breaks when you use outside coupon codes, load your cart before clicking through, or buy excluded gift cards. Portal purchases also reset inactivity expiry clocks, making them cheap insurance for idle balances.