How can I trigger the payment by using "FPS App to App"?

After you have confirmed all payment details in merchant app, you can select "Airstar Bank Mobile App" from the payment options. You'll then be asked to log on to Airstar Bank Mobile App. Upon successful log on, you will be able to see the payment details. Please confirm all the payment details are correct and authorise the transaction with Account Password / Mobile One-Time-Password.