Upon the following, the processor shall notify the seller, on a form to be prescribed by the department, as to the requirements set forth in Sections 55601 and 55881:
(a) Upon delinquency of a contract.
(b) If payment is not made within 30 days when the contract does not specify time of payment or if there is no contract.
(c) If payment is not made within 30 days when the contract is oral, irrespective of the agreed time of payment.
The processor shall have the burden of proof as to the timely delivery of such a notice.
Such a notice shall only be required as to the first contract between any particular seller and processor during any one calendar year.