Actually the HP dealer is to be blamed here. Some HP dealers deliberately rig their pos machines to fail credit card transactions to avoid paying the MDR charges. Same thing happened to me the first time I tried the card. The swipe machine read failed transaction even though my card was active and the guy insisted me to pay using his paytm qr code. Apparently they do not have to pay high MDR charges if paid using paytm QR code. Same problem happens at many other petrol pumps too be it BPCL/IOCL/HPCL. Many fellow TF members have complained about being unable to redeem BPCL Octane card's reward points because the petrol pump doesnt have the correct POS machine. To overcome this issue HPCL has pasted their own qr codes on the walls. This eliminates the whole POS machine hassle while also giving more return. If the petrol pump guy denies using the QR code for HP pay then u can email a complain to HP website. The manager will himself call u and apologise( real story..read it somewhere is reddit). HPCL is minting huge money through their cobranded cards in the market. They r more than happy when customer uses HP pay app. Currently HP pay app+IDFC PP card is the most rewarding and smooth process among all fuel cards.