When the consumer has paid all periodic payments required by a rent-to-own transaction together with any other charges authorized by law which have been lawfully imposed in the transaction, he or she shall have exclusive ownership of the goods: Provided, That the consumer, after the initial payment, may obtain ownership before the scheduled end of the rent-to-own transaction by paying:
(1) A portion of the periodic payments, which have not yet become payable, subject to any limitation provided by this chapter;