Section 1. Every provision contained in, or made with respect to, any obligation which provision purports to give the obligee the right to require payment in gold or in a particular kind of coin or currency other than Philippine currency or in an amount of money of the Philippines measured thereby, be as it is hereby declared against public policy, and null, void and of no effect, and no such provision shall be contained in, or made with respect to, any obligation hereafter incurred. Every obligation heretofore or hereafter incurred, whether or not any such provision as to payment is contained therein or made with respect thereto, shall be discharged upon payment in any coin or currency which at the time of payment is legal tender for public and private debts: Provided, That, if the obligation was incurred prior to the enactment of this Act and required payment in a particular kind of coin or currency other than Philippine currency, it shall be discharged in Philippine currency measured at the prevailing rates of exchange at the time the obligation was incurred, except in case of a loan made in a foreign currency stipulated to be payable in the same currency in which case the rate of exchange prevailing at the time of the stipulated date of payment shall prevail. All coin and currency, including Central Bank notes, heretofore or hereafter issued and declared by the Government of the Philippines shall be legal tender for all debts, public and private.