(a) The remedies provided by this article are exclusive and shall be in lieu of any and all remedies provided by common law or by other provisions of this code.
(b) Retroactive monetary relief for an unconstitutional tax shall be granted only at the express order of a court of competent jurisdiction which appears in a final decision of that court. Notwithstanding any other provision of this code, a final decision ordering retroactive monetary relief may not be considered to override any statute of limitations contained within this article, or to require relief for any claim which is res judicata.
(c) Retroactive monetary relief shall comprise only a refund of the unconstitutional tax, or of the portion thereof that the court has ordered refunded, which actually has been paid by the taxpayer, together with any penalties or interest which are based upon the taxpayer's failure to pay the unconstitutional tax and which actually have been paid by the taxpayer.
(1) Except as otherwise provided in this section, retroactive monetary relief shall be paid to the taxpayer in a lump sum within one hundred eighty days of the final decision which orders the relief.