Follow these steps to create APN profile:
Using a phone/laptop, go to any browser and key in tplinkmodem.net
Set the Password as Qashier2580
Click on 'Lets Get Started' to proceed to the configuration page
On the top navigation bar of the page, select 'Advanced'
Select 'Network' on the navigation bar located at the left-hand side of the page
Under Network, select "Internet"
Select "Create Profile" near the bottom of the page.
Enter the profile name as your provider's name (For e.g. StarHub)
Enter the APN as your provider's name (For e.g. StarHub)
Click 'OK' and followed by 'Save'
Once the above steps are completed, the configuration will be successfully implemented
Reconnect your POS to the wifi of the 4G router