Payment for the goods will be carried out by HEALTH PRODUCT COMPANY on the basis of an invoice – tax document issued by the contractor within 15 days from the date of the chargeable event. The invoice must contain all the elements of a tax document. HEALTH PRODUCT COMPANY is entitled to return the invoice to the buyer, unless it contains any of the statutory or negotiated requirements or if it contains incorrect price information. The date of payment of the purchase price to the seller shall be the date of debiting an amount representing the purchase price from the buyer’s bank account.