Keepsake: Paid Product Add‑ons

Keepsake: Paid Product Add-ons is designed to help merchants charge extra for optional product customizations such as names, gift messages, gift wrap, and similar add-ons. The app emphasizes simplicity: merchants can add a single checkbox and, when needed, a text box to product pages, set a price for the add-on, and have that fee stay attached to the item in the cart so it cannot be removed separately. It also notes that the selected option appears on the order, making it easier to track customer choices without needing any design work.