get Payer Fio Address
The FIO address (not name) of the payer, owner of payee_fio_name. Ex.: "FIO6m1fMdTpRkRBnedvYshXCxLFiC5suRU8KDfx8xxtXp2hntxpnf"
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string payer_fio_address = 2;
Return
The payerFioAddress.