What are the standard requirements for an approved invoice?

• An invoice must be to an established customer that has a history of meeting your payment terms.
• Your customer is an Australian domestic company and business.
• Your customer has traded for 6 months or more. 
• Your tax invoice includes the issue date and payment(s) due date(s) 
• Reference to contract number or to purchase order. 
• Payment terms of between 15-90 days