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system
what happens if a purchase is $0.02 in canada?
user
as someone who works for a company that deploys pos systems in canada, i can tell you that your best bet would be to have a configuration option that lets the client decide what to do. if they have a business practice that would allow for a sale total to be $0.01 or $0.02, they should first evaluate their business practice.  if you're building a pos system to deploy in canada, i'm sure you have access to resources (potential clients) who would already know how they would want to handle this. ask them.
assistant