Go to Purchase Digital Credit (/profile/purchasecredit) from the left menu — it only shows up when the business has this feature turned on. Each package card shows the wallet credit you'll receive, the price (with any sale price already applied), and whether it's a one-time purchase or a recurring subscription. Click Buy now (or Subscribe for recurring packages) — this adds the package to your cart and takes you to checkout to pay; the credit lands in your wallet once the order is paid.