As part of Payroll business objects, we load the Banks, Branches, External Bank Accounts and Personal Payment Methods to load the Bank Account details of employees for the Payroll to process the earnings to employees.
Masking involves displaying only a few specific characters of the account number or IBAN number, usually characters at the start or end of the number.
In order to set the masking options, we need to navigate to the “Manage System Security Options” task under Setup and Maintenance.
If the Masking has not been enabled, this is how the screen would look like:

Masking Type of “Display All Digits” means the Bank Account Number is not masked yet.
In order to setup the masking, click the Edit Masking button in Bank Account Numbers section.
Here are the options available for maskinng:

Most of the customers use the below setting:

This setting leaves the last 4 digits as-is and masks the numbers before the last 4 digits.
Click Save and Close. It will prompt to run the process, which masks the existing data present in the system if any.

Click Yes to run the process.
The process “Mask External Bank Account Data” will run and update the bank account numbers based on the settings we did.

Once the process is successful, we can go to the application and verify that bank account numbers are masked.

If for any reason, the masking needs to be turned off, we need to follow similar steps and turn it off.