Thanks, MTS_Ciaran, for that suggested workaround. It's odd that the button advanced features still provides the option to include a custom message to seller if that feature has been deprecated. I tried the option you suggested but, unfortunately, it includes the custom message right below our button on our website which is not the ideal user experience. Do you happen to know of any other ways to add this message to the checkout screen and not to the website button display? Many thanks!
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