1) One reimbursing in legalese 2) Payees debtor 
(payer) n. the party who must make payment on a promissory note.
• (n.) See Payer.
The person, institution of government who is responsible for making of the payment to the payee as mentioned in the promissory note or bills of exchanges.
Pay·or' noun (Law) See Payer . [ R.]
The person or entity that is responsible for payment on a promissory note or bill. May also be spelled payer.