Occasionally you may run into suppliers who want to see a business license before they will sell to you. These suppliers will generally have large minimum orders and wish to determine that you are serious about purchasing their goods.
Getting a business license is fairly straight forward. You need to contact your local court house or country clerk's office and they will direct you to the person you need to speak with. Some states will charge a fee for a business license application.
For registering your business in Canada, please refer to this guide -
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Hope this helps :)