Change of Internal Bank Accounts

Using Release 12.1.3

Hi - this might be a vague question - I'll ask anyway.

I have a call for a customer who is using Oracle EBS Release 12.1.3.

They are moving to a new Bank, so will need to set up a load of new Internal Bank Accounts in Cash Management.

On the Payables side, I realise that once they have been set up, I understand they will need to update their Payment Process Request Templates to link to these new Bank Accounts.

However, I am not so familiar with AR and Cash Management.

The customer is using standard functionality - so I am not sure where in AR or CM that they would need to make changes to link through to these new Bank Accounts?