To receive an Authentication Code to approve or reject a payment order, your mobile number will have to be first updated and then verified. You can update and verify your mobile number by following these steps.
Once your mobile number has been verified, you can approve or reject an order by following these steps. When you try to approve or reject a payment order, you will receive an Authentication Code as a text message which you can input to approve or reject the order.


You might be interested in the following questions
How do I know that I have a payment order pending for my approval?
Why do I need an Authentication Code or Approver Code to approve/reject a payment order?
Can I approve a payment order without an Authentication Code or Approver Code?
What is the difference between Authentication Code and Approver Code?
How can I get an Authentication Code to approve or reject a payment order?
How can I get an Approver Code to approve or reject a payment order?
How can I approve orders if I am unable to verify my mobile number?
I received multiple Authentication Codes, which one should I use to approve or reject an order?
I am getting an error that my Authentication Code is not valid or has expired?