From sole propr., OR LLC, OR partneship or OR Corp.: Each requires an entity certificate filing.
All Retail Trade businesses/entities need a business license and an EIN.
Selling/Buying wholesale or retail requires a OR seller's permit.
You can choose to be a(n) :
Gresham Business Tax Registration ( Business License) All businesses including home, online or mobile BUSINESS need a BUSINESS license because they are BUSINESSES.