The most popular payment methods in online casino apps include \\u003cstrong\\u003eUPI, PayTM, PhonePe, GPay, bank transfer, VISA / Mastercard cards, and e-wallets like Neteller, AstroPay, Skrill, and Easypay\\u003c/strong\\u003e. Players can conveniently deposit funds or withdraw winnings in Indian rupees using these methods.