From OpenStreetMap Wiki
|Shop branch id number|
|Used on these elements|
|Tools for this tag|
|This is just a draft for a new tag. There was no proposal for this tag and it is rarely used at all. Consider using shop=* in combination with ref=*. This is used 100 times more than the tag on this page.|
|This key page is a stub. You can help OpenStreetMap by expanding it.
Similar pages for structural reference; Key:religion, Key:waterway
This key ref:shop:num references a shop=* by the specific number assigned to it by the owning corporation. The number can usually be found on the shop's location page.
|name=*||The name of the shop.|
|opening_hours=*||Hours of operation.|
|amenity=*||Refers to the kind of service or items being sold.|
|ref:shop:num=*||The corporation's reference number for the specific shop.|