Buyer is a capability, not a role. A capability, not a role. Anyone — Staff or Manager — can be set as a Buyer for a shop.

What a Buyer can do

Use the Buy tab in shops they're a buyer for
Pick items at the wholesaler for the active shopping run

Setting someone as a Buyer

In the staff edit sheet, every shop card has a Buyer toggle next to the role chips. Turn it on for any shop where the person should be able to use the Buy tab.

Automatic buyer privilege

Owners, Admins, and Managers automatically get buyer access in every shop they can see - they don't need the Buyer toggle. The toggle is for promoting Staff members. In the staff list, members with implicit buyer access show a small auto badge so it's clear where the privilege is coming from.

Per-shop buyer flag

Buyer is per-shop. A person can be a Buyer at Shop A but not at Shop B. This is the right model when one person handles ordering for a specific location.

What it doesn't change

Marking someone a Buyer only unlocks the Buy tab. It doesn't elevate their role - a Staff member with Buyer capability is still Staff everywhere else (can't invite others, can't change settings, etc.).