How to list a co-owner? So, that we can register for Shopify payments

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Hi. I know Shopify payments does not work here in the Philippines, but I have a friend  in the US who would want to partner up with me to make this work. Where can I list his name as a co-owner to avoid being flagged by Shopify? I don't know if it violates any Terms of Service, but it's better safe than sorry