found a solution: https://community.shopify.com/topic/1034175
Topic summary
A user sought to add specific payment icons (Visa, Mastercard, American Express) to their store footer.
Another participant provided a Shopify help documentation link about adding credit card icons to vintage themes.
The original poster found this resource unhelpful, describing it as confusing.
They ultimately discovered their own solution through a Shopify community thread addressing payment icon display issues in the Brooklyn theme.
Status: Resolved - the user found a working solution independently.