Embodiments provide a method of facilitating a payment transaction with a payment card of a customer. The method includes receiving a payment transaction request initiated at a merchant terminal. The payment transaction request comprises a merchant transaction amount associated with a purchase entered at the merchant terminal and a fingerprint tap input provided by the customer on a fingerprint input module, the fingerprint tap input indicative of a customer transaction amount associated with the purchase. The method includes facilitating verification of a fingerprint obtained from the fingerprint tap input of the customer by comparing with stored fingerprint of the customer. The method further includes, upon successful verification, determining whether the merchant transaction amount conforms to the customer transaction amount obtained from the fingerprint tap input. The method further includes facilitating the payment transaction associated with the payment transaction request if the merchant transaction amount conforms to the customer transaction amount.