Android Question help: reading a credit card using NFC

Zeev Goldstein · Jan 25, 2022

hello,

for a project i'm testing i need to be able to read a credit card using NFC
i need to read tags & track2
i tried to to go through the few articles here but got lost
is there anyone who can help?
i sample code will be highly appreciated
for a complete function or snippet that will save me development time i'm happy to donate

thank you

josejad · Jan 25, 2022

Maybe @drgottjr can help you, he's fighting with NFC too

Zeev Goldstein · Jan 25, 2022

José J. Aguilar said:
Maybe @drgottjr can help you, he's fighting with NFC too

thanks
i am sure someone had managed doing this
i wouldn't want to have a fight over that
but if the honorable @drgottjr had won this fight i will be more than glad to be assisted by him...

f0raster0 · Jan 25, 2022

I stopped using RFID/NFC+B4A years ago - the last version of the library NFC that worked for me was 1.25

NFC is an internal library now then probably can do much more or the team B4X can add new features if needed

What inf do you want to read from that credit card? The public information or so?

If you want to read the tag to work with payments..it could help:

NFC - Read EMV Cards?

Hello, Is it possible to read data from an EMV credit card via NFC for an Automated PayPal (API) Payment System? I found information about NFC in the community. However, nothing in connection with credit cards I found the following Lib. However, I can not integrate that easily because there...

www.b4x.com

NFC - Reading and Writing

NFC v2.00 adds support for low level access to the NFC features. This allows reading and writing from NFC tags. The NFC library provides three features: - Reading Ndef tags based intent filters: Reading NDEF data from NFC tags - Sending data between two devices (Android Beam)...

www.b4x.com

Zeev Goldstein · Jan 25, 2022

f0raster0 said:
I stopped using RFID/NFC+B4A years ago - the last version of the library NFC that worked for me was 1.25

NFC is an internal library now then probably can do much more or the team B4X can add new features if needed

What inf do you want to read from that credit card? The public information or so?

If you want to read the tag to work with payments..it could help:

NFC - Read EMV Cards?

Hello, Is it possible to read data from an EMV credit card via NFC for an Automated PayPal (API) Payment System? I found information about NFC in the community. However, nothing in connection with credit cards I found the following Lib. However, I can not integrate that easily because there...

www.b4x.com

NFC - Reading and Writing

NFC v2.00 adds support for low level access to the NFC features. This allows reading and writing from NFC tags. The NFC library provides three features: - Reading Ndef tags based intent filters: Reading NDEF data from NFC tags - Sending data between two devices (Android Beam)...

www.b4x.com

basically i would like to be able to read all readable data
in particular the card number (track2) and any tag available
is there any demo or snippet or anything i can see and learn from or ever use ?

drgottjr · Jan 25, 2022

i was interested in contactless smartcards. i didn't want to spend money for a reader that i'd have to carry around with me all day and plug into my phone with your reference to tracks 1 and 2, it sounds like you're looking at the stripe or the chip, for which you'll need a reader.

technically, a certain amount of reading contactless cards is trivial (i've compared what i've been able to do against some apps downloaded from play.) the biggest hurdle is the tons of undocumented proprietary data which you have to purchase from each card issuer at considerable cost.

i just did some tweaking on my "reader" last night. you can try it if you like. i think it runs ok. there's an earlier here somewhere. by the way, contactless cards do give up what's called "track 2 equivalent" data. didn't strike me as adding much to what the cards had already told me. but then i don't know what your plans are for using the data.

f0raster0 · Jan 25, 2022

Zeev Goldstein said:
basically i would like to be able to read all readable data
in particular the card number (track2) and any tag available
is there any demo or snippet or anything i can see and learn from or ever use ?

Yes.. try the links!

You can't read all the data so simple - RFID isn't just read.. you need the key etc.. reading public information is OK see the link above.

I'm almost sure you will need to talk to the bank if you wqnt something about payments.

Zeev Goldstein · Jan 26, 2022

drgottjr said:
i was interested in contactless smartcards. i didn't want to spend money for a reader that i'd have to carry around with me all day and plug into my phone with your reference to tracks 1 and 2, it sounds like you're looking at the stripe or the chip, for which you'll need a reader.

technically, a certain amount of reading contactless cards is trivial (i've compared what i've been able to do against some apps downloaded from play.) the biggest hurdle is the tons of undocumented proprietary data which you have to purchase from each card issuer at considerable cost.

i just did some tweaking on my "reader" last night. you can try it if you like. i think it runs ok. there's an earlier here somewhere. by the way, contactless cards do give up what's called "track 2 equivalent" data. didn't strike me as adding much to what the cards had already told me. but then i don't know what your plans are for using the data.

thanks for your input.
i'm going the other way - checking to read credit card using my nfc on my phone for getting payments
an ready close apk doesn't help me so thanks but i can't use it not even for learning the technique

Zeev Goldstein · Jan 26, 2022

f0raster0 said:
Yes.. try the links!

You can't read all the data so simple - RFID isn't just read.. you need the key etc.. reading public information is OK see the link above.

I'm almost sure you will need to talk to the bank if you wqnt something about payments.

i just need to read. nothing to write
i need track2 from the card and i need the card's tags
i know people did iy on android phone (using other dev tools)
i'm using b4a (and like it very much) so i'd like to stay and use it for my project
no need for any external reader as the phone has a built in NFC reader

Zeev Goldstein · Jan 26, 2022

drgottjr said:
i was interested in contactless smartcards. i didn't want to spend money for a reader that i'd have to carry around with me all day and plug into my phone with your reference to tracks 1 and 2, it sounds like you're looking at the stripe or the chip, for which you'll need a reader.

technically, a certain amount of reading contactless cards is trivial (i've compared what i've been able to do against some apps downloaded from play.) the biggest hurdle is the tons of undocumented proprietary data which you have to purchase from each card issuer at considerable cost.

i just did some tweaking on my "reader" last night. you can try it if you like. i think it runs ok. there's an earlier here somewhere. by the way, contactless cards do give up what's called "track 2 equivalent" data. didn't strike me as adding much to what the cards had already told me. but then i don't know what your plans are for using the data.

hi
i did try your app
it did read the card
there is a text presented
some i see is data from the card (presented in HEX)
can you explain what data you got from the card?
did you manage to get TRACK2?

now, i hope i'm not too rude - will it be possible to get the code so i can learn from it?
thanks

f0raster0 · Jan 28, 2022

Zeev Goldstein said:
i just need to read. nothing to write
i need track2 from the card and i need the card's tags
i know people did iy on android phone (using other dev tools)
i'm using b4a (and like it very much) so i'd like to stay and use it for my project
no need for any external reader as the phone has a built in NFC reader

to read for payments system you need the key - it's not just read. You need to "talk" to the card. NFC in phone are there for over 7+ years

The public data will be simple to read. Just run the example

f0raster0 · Jan 28, 2022

hi @Zeev Goldstein

You can start with the example attached, it is based in Erel and udg examples.
I tested the demo, and I can read my ViSA ~~and show the number~~. EDIT: with the demo attached I can read the card's ID

Zeev Goldstein · Jan 30, 2022

f0raster0 said:
to read for payments system you need the key - it's not just read. You need to "talk" to the card. NFC in phone are there for over 7+ years

The public data will be simple to read. Just run the example

thanks,
there's no key on the NFC chip on the card as far as i know

Zeev Goldstein · Jan 30, 2022

f0raster0 said:
hi @Zeev Goldstein

You can start with the example attached, it is based in Erel and udg examples.
I tested the demo, and I can read my ViSA ~~and show the number~~. EDIT: with the demo attached I can read the card's ID

thank you for this
i will try to learn from it

Zeev Goldstein · Feb 1, 2022

f0raster0 said:
hi @Zeev Goldstein

You can start with the example attached, it is based in Erel and udg examples.
I tested the demo, and I can read my ViSA ~~and show the number~~. EDIT: with the demo attached I can read the card's ID

hi,
firstly - once again thank you for your good will and assistance
i did try to see and run your code - it works
however i think either i am missing something or it does not read the data right
when i read a card i get a HEX code like EFA110B7
from that i can't see the track2 or any other element from the card
what i need is track2 and the tags on the cards

since i really got lost here, maybe you can create a working sample to read that data (i am happy to donate for your time & effort)
so i can then use it in my test project?

it can be either a code for a function to call that will return the required data
or a library so no code but still i can get the data i need

does that sound like something doable?

thanks

f0raster0 · Feb 1, 2022

Zeev Goldstein said:
when i read a card i get a HEX code like EFA110B7

yes, that is an example. Using that example you will read the ID like EFA110B7
download the "App Tag Info" from NXP then you can check if that "EFA110B7" is correct.

After done that test you can move to try to read your "track2"

Zeev Goldstein · Feb 1, 2022

f0raster0 said:
yes, that is an example. Using that example you will read the ID like EFA110B7
download the "App Tag Info" from NXP then you can check if that "EFA110B7" is correct.

After done that test you can move to try to read your "track2"

thank you.
what is NXP? what's the url?
i don't have that info on the card so i can't check if it is correct
since it is credit card the best test is checking the card's data

how can i read Track2?
how can i read the Tags on the card?

is there a way you can help me with that?
as said i'm happy to pay/donate for this help as i need it urgently

the odd thing is that i searched all community and there is no one asking that other than me
there were a few questions but very long time ago and no answers
or maybe i missed this too...

once again thanks

f0raster0 · Feb 1, 2022

Zeev Goldstein said:
thank you.
what is NXP? what's the url?

NXP: https://en.wikipedia.org/wiki/NXP_Semiconductors

using their App "Tag Info" (check on googleplay) you can check if the app demo b4a is reading the correct ID

Zeev Goldstein said:
how can i read Track2?
how can i read the Tags on the card?

if you are reading some data - then your reading the TAG.
I used B4A years many years ago to read tags.. for "smart lockers" but when the NCF lib1.5 was updated I moved my project to use just a microcontroller then not sure if I can help looking for that Track2 that i don't see anywhere..

Zeev Goldstein · Feb 1, 2022

f0raster0 said:
NXP: https://en.wikipedia.org/wiki/NXP_Semiconductors

using their App "Tag Info" (check on googleplay) you can check if the app demo b4a is reading the correct ID

if you are reading some data - then your reading the TAG.
I used B4A years many years ago to read tags.. for "smart lockers" but when the NCF lib1.5 was updated I moved my project to use just a microcontroller then not sure if I can help looking for that Track2 that i don't see anywhere..

first of all thanks for even trying
as i am quite a rookie here and this is somehow killing me as i can't even move one step ahead i feel bad...
i must find a solution
and it seems this had not really been discussed here like no one is interested
as i even published i would even pay for it and no one responded - like this is a problem no one managed to overcome
strange...

f0raster0 · Feb 1, 2022

I understand you.

try the job forum,

Job Offers

Do you have a job offer / project for developers? Post it here.

www.b4x.com

Android Question help: reading a credit card using NFC

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