How to get the Payee instrument Id in the Java validation at receipt creation level

I'm creation a custom validation to be used at Order level in the receipt creation program. I'm trying to find the payee details. In the java method used for validation, these are the available input parameters as mentioned in the implementation guide. I'm not able to derive the payeeInstrumentId using these parameters.

This is the Java validation method with the signature :
ValidationSetResult validate(Integer paramInteger, Payee paramPayee, PmtInstr paramPmtInstr, Tangible paramTangible, Transaction paramTransaction).

How do we get the Payee instrument Id ?

For example, to get the PayerInstrumentId , we use
BankAccount localBankAccount = (BankAccount)paramPmtInstr;
localBankAccount.getInstrAssignmentId();

and this works for Payer Instr Id, but I'm unale to derive the Payee Instr Id.