You can't use a payment method with GrabPay if the wrong card details were entered, the card is not supported, insufficient funds or credit limit to cover the original fare, or if required by your bank, the OTP (one-time password) entered was incorrect.
With GrabPay, you can add your choice of payment method to enjoy the convenience of cashless payment. Tap your , then GrabPay and tap Add Payment Method and never fumble for cash again. Supported payment methods include Visa, MasterCard, and American Express.
Let us know, after checking your payment method details are accurate and supported if you still are unable to use a payment method.