When we create a PS4 account, we need our postal code. which meets our billing and territory requirements. Because in the billing address we have to add the postal code so that the tax information is clear on you.
Also if you have your own digital store you can restrict some parts of it. Postal code allows you to charge in your local currency.
What is a Postal Code?
Postal codes are used to group people into geographic areas. A unique postal code identifies the area. With the help of postal code, the information of address, es, etc. of different areas is available and is used by different companies, especially nowadays in the field of e-commerce, postal code has gained a lot of benefits. This has prevented many frauds.
Where is the Postal Code added in PS4?
To add a postal code to PS4, you first need to open its settings.

After opening the settings click on user and accounts option.

After that, open the account and click on the address option.

After that, you have to add the postal code, city, and province, then click OK.

The full address will then be added to your PS4.