In Australia a business or company should have ACN or ABN number.
An ACN is a 9-digit number issued to companies by the Australian Securities and Investments Commission (ASIC). It confirms that a company is legally registered under the Corporations Act.
An ABN is an 11-digit number issued by the Australian Business Register (ABR) to all types of businesses, including sole traders, partnerships, and companies. It is used for tax purposes, invoicing, and GST registration.