https://www.desidime.com/discussions/lpg-payment?page=1#post_9813745
how many you mean by bulk?
Don't know about bulk payments, but for personal use Amazon Pay is best. For Amazon, you can utilize Amazon Pay gift card balance, avail RuPay platinum debit card 20% discount once a month on Fridays.
But I think there limit on how many electricity and LPG bills one can pay in a month from single account. (4 / 5 payments?)
Edit : If you are running some business of payments , seek out commercial solutions.
Amazon pay?
But I need bulk with Good Discount
Then try different platforms also Paytm,gpay, phonepay...