Using field CUSTOMER_BANK_ACCOUNT_ID after upgrade to R 12.1.3

We are upgrading to R 12.1.3 .At 11.5.10.2 we used the field CUSTOMER_BANK_ACCOUNT_ID to populate the Customer bank account.

We are using auto Receipt to apply and close the customer Invoice. the Customer can have some different bank accounts that we can use.

The quentity of invoices to be created at every run  is over 600K invoices from an external source

From note 1082098.1 I understand we need to use:

" API: IBY_FNDCPT_TRXN_PUB.Create_Transaction_Extension Call this API prior populating Autoinvoice with the transaction lines and fill the RA_INTERFACE_LINES_ALL.PAYMENT_TRXN_EXTENSION_ID with the result of this API."