By default, the coupon field on your WooCommerce checkout page is collapsed and hidden (and sometimes missed by the user). If like some folks, you’d like the checkout page coupon field to be expanded at all times, then the following code will do just that
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functions.phpfile or via a plugin that allows custom functions to be added, such as the Code snippets plugin. Please don’t add custom code directly to your parent theme’s
functions.phpfile as this will be wiped entirely when you update.