For the purpose of evidencing the indebtedness, the governing authorities of parishes, school boards and municipal corporations, subject to the conditions hereinafter prescribed in this Chapter, may issue to any creditor, his representative, assignee, or transferee, a certificate of indebtedness for the amount of the debt due him; provided that two or more debts may be combined and a certificate issued for the whole.
La. R.S. § 39:1173