Looking at the data from the previous year, both Monthly Gift Orders and Zendesk feature requests had a decent amount of volume per month, and volumes for both increased towards the end of the year leading up to the holiday months. Monthly on-site search intent for "gift cards" was also a strong indicator of demand.
While exact Google search match for "Brandless Gift Cards" was low, there was a ton of long tail related matches for "gift cards for students" or "healthy grocery gift card", showing a strong demand for these types of gift cards.