Using my custom domain for the checkout page when using Buy Button

@jakedoering Hi Jake, yes, sorry, I am on Basic too…
so I think I have a slightly different case, I ONLY USE THE BUY BUTTON, that I embed in my third party domain / wordpress.
If I follow your instruction and connect my domain with shopify, traffic will be forwarded to the storefront, which I dont want.
this is my domain: https://bodyclock.health/schlaf
(and i am using a WP shopify buy button because if I use the code from shopify, i can only use it once on the page, otherwise it displays the buy button twice - another problem i haven’t found an answer to here in the community):
[wps_products_buy_button title=“RNA-Haartest & Ergebnisbericht” hide_quantity=“true”]
any help greatly appreciated!
Philipp