On this page we actually have a button for payment in Steem https://www.intothegardenofeden.com/store/c26/GOE_High_Vibe_Health_Supplements.html
Here is a page where I have my hand made custom SteemGear available for steem https://www.intothegardenofeden.com/store/c51/SteemGear_Shop.html
Though I haven't integrated the button yet just been doing it old school style.