This site displays an accepted-payment-cards image directly beneath each of its three "Buy" buttons — worth understanding what this detail is, and isn't, confirming.
Worth reading this as a standard payment-method indicator — Mastercard, Visa, American Express and Discover — confirming which card networks are accepted, not the identity of the checkout processor itself.
Worth reading this payment-cards detail alongside the site's own separate note that the checkout may display the seller's store name, MemoHoney — both are details worth checking at the actual checkout page.