Absolutely! When you pay with LevelUp, you’ll not only save money, but you’ll still earn credit card rewards just like you normally would. Just link any card you want and you’ll still get miles, cash back bonuses or points.
If your card gives you bonus rewards based on categories (restaurants, for example), you may not receive the full bonus as LevelUp's category may be different from the merchant's.
However, the rewards you'd get with LevelUp typically far outweigh any bonus you'd get from your credit card alone!