Credits are used to make purchases of upgrades for your LSN advertisements (Example: Featured Ads or Title Bolding). Buying credit packs offers bundled discounts that save you time and money.
Purchase a credit pack bundle with a single credit card purchase avoiding multiple credit card transactions. Use the credits to upgrade your ads and expedite the checkout process.
Buying larger credit packs at the discounted price allows you to save more money when upgrading your ads.