How will I know if the auto payment is successful?

You will receive a payment confirmation notification on your PhonePe app and an SMS from your bank for every successful auto payment. Alternatively, you can check the History section or the AutoPay section of your PhonePe app as per your scheduled payment date for a confirmation.

Related questions:
What do I do if the AutoPay debit for my bill payment fails?
What if my account balance is not enough for the scheduled auto payment?
How do I check my AutoPay details on PhonePe?