Short version: It's not possible to protect shipping methods, billing methods, or coupon codes.

Shopify keeps a pretty tight leash on the checkout process itself, and third-party apps aren't permitted to get involved here at this time.

If you absolutely must set up different shipping or billing terms, your best bet may be to set up a completely new Shopify store.

If you want to dig into this further, get in touch with the Shopify support crew directly, at

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