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Businesses can, but are not obliged to issue a proof of purchase (invoice or receipt). Namely, a proof of purchase has to be provided to the customer if asked.
Switzerland
Businesses are not obliged to issue proof of purchase. However, a paper receipt serves as proof of purchase and can be issued either in paper or digital form
Type of fiscalization: non-fiscal country
There are no strict rules or a legally mandated fiscalization system for cash registers or POS systems.