A method for providing a digital representation of a transaction card in a mobile 2. device (200, 300, 402), comprising: detecting, by a near field communication unit (202, 412) of said mobile device, that the transaction card is in proximity of the mobile device; upon or after said detecting, performing, by a processing unit (204, 404) of said mobile device, the following steps: retrieving the digital representation of the transaction card from a digitization server; loading the digital representation of the transaction card into a memory (206, 408) of the mobile device; activating the digital representation of the transaction card for a predefined validity period; invalidating the digital representation of the transaction card, characterised in that the digital representation of the transaction card is invalidated if, within said validity period, no successful near field communication transaction has been performed with the mobile device (200, 300, 402) on an external near field communication reader; wherein the processing unit further causes, upon or after said detecting, the digital representation of the transaction card to become a permanent digital representation of the transaction card if, within said validity period, a successful near field communication transaction has been performed with the mobile device (200, 300, 402) on the external near field communication reader, such that it is prevented that cards are digitized somewhere on the go by an attacker, as it will not be possible to perform an NFC transaction quickly enough to make the card permanent. detecting, by a near field communication unit (202, 412) of said mobile device, that the transaction card is in proximity of the mobile device; upon or after said detecting, performing, by a processing unit (204, 404) of said mobile device, the following steps: retrieving the digital representation of the transaction card from a digitization server; loading the digital representation of the transaction card into a memory (206, 408) of the mobile device; activating the digital representation of the transaction card for a predefined validity period; invalidating the digital representation of the transaction card, characterised in that the digital representation of the transaction card is invalidated if, within said validity period, no successful near field communication transaction has been performed with the mobile device (200, 300, 402) on an external near field communication reader; wherein the processing unit further causes, upon or after said detecting, the digital representation of the transaction card to become a permanent digital representation of the transaction card if, within said validity period, a successful near field communication transaction has been performed with the mobile device (200, 300, 402) on the external near field communication reader, such that it is prevented that cards are digitized somewhere on the go by an attacker, as it will not be possible to perform an NFC transaction quickly enough to make the card permanent. retrieving the digital representation of the transaction card from a digitization server; loading the digital representation of the transaction card into a memory (206, 408) of the mobile device; activating the digital representation of the transaction card for a predefined validity period; invalidating the digital representation of the transaction card, characterised in that the digital representation of the transaction card is invalidated if, within said validity period, no successful near field communication transaction has been performed with the mobile device (200, 300, 402) on an external near field communication reader; wherein the processing unit further causes, upon or after said detecting, the digital representation of the transaction card to become a permanent digital representation of the transaction card if, within said validity period, a successful near field communication transaction has been performed with the mobile device (200, 300, 402) on the external near field communication reader, such that it is prevented that cards are digitized somewhere on the go by an attacker, as it will not be possible to perform an NFC transaction quickly enough to make the card permanent.