android - Credit card reader and reading mechanism -


i have 3 different credit card of different companies. wanted use them in app. , app should communicate , work of these 3. our customer requirement. researching on them not successful. following card readers supposed work app.

1) square reader
2) ingenico
3) paypal

these 3 inserted in audio jack of mobile device. quite confuse work them. , didnot find library work them. following confusions , questions.

  1. first of need know can record audio audio jack can record audio of square card reader paypal , ingenico not responding. need sort of sdk or thing other 2 ?
  2. how convert audio recorded square card reader strip card data information , mean name , card number, card expiry date etc. ?
  3. is recorded audio possible convert card data ? think in encrypted form , company wont disclose encryption technique security reasons ?
  4. what right way of implementing card reader? need sdk or api ? there library (new library saw rhoumbus not seems work now) ?

please let me know how work them , right way ?


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