One email, then sign in with Square to approve access to your catalog and stock, so within can list your items and move the stock it sells. Sign-in links for your order counter go to this address.
Your merchant portal sign-in and order alerts. You can change it later from the portal, with email confirmation. On the next screen Square asks you to approve reading your items, stock and business profile, and adjusting stock for the pieces within sells. It also lists order and payment permissions: within only uses those when marketplace sales are set to appear in your Square Dashboard, which is off today, so your orders live on your within counter.
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