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All free Shopify themes include the option to display payment icons in your footer. The icons that show are determined by your store's payment settings and can be enabled in the theme editor. If you want to add or remove payment icons without changing your payment settings, then you can do so by editing your theme code. To enable payment icons in your theme editor, we have a guide here to show you how.
Also, there is a handy guide here on how to create and add specific payment icons to your Shopify store footer. If there is anything else I can help you with, please let me know.