Why does .myshopify come up in payments statments and not custom domain?

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I Accidently put the wrong thing as .myshopify store domain, and cant fix it because apparently its impossible without starting a new store which i cant do because I already have too many products and some sales and seo traffic,  anyway I have a custom domain BUT the original my shopify domain still comes up when customers purchase in their statements. HOW DO I CHANGE THIS!!