Thanks Earnie to your suggestion.
Sounds like you have a need for drupal.org/project/og which allows
assignment of a user as administrator of a group (shop) to allow other
users (customer) access to the group (shop). Or perhaps something
like drupal.org/project/domain and friends to assign a sub-domain to
shop where customers are independent of other shops.
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Earnie
-- https://sites.google.com/site/earnieboyd
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