how to prevent to customer to add same credit card

Question

I am using stripe as my payment provider and storing encrypted credit card id in my db returned from stripe.

My question is that from GUI customer can add same card again. I see stripe do not prevent to add same card multiple time for same customer. Since stripe always generates different encrypted card id for same card so I can't use it to validate if same card is being added again.

How can stop customer to add same card again again.

Answer 1

Looks like I got that . I can use fingerprint returned in json response. I saw stripe dashboard and found that fingerprint is always same for same card which I was adding again again.

Here is json request and response to confirm

Request

{
  "source": {
    "number": "378282246310005",
    "cvc": "123",
    "address_line2": "4th Floor",
    "address_line1": "140 2nd Street",
    "address_country": "USA",
    "name": "VIAY KUMAR",
    "address_state": "CA",
    "exp_month": 12,
    "exp_year": 2015,
    "address_zip": "94105",
    "address_city": "San Francisco",
    "object": "card"
  }
}

Response

 {
      "id": "card_166H9rC8Y8JrMFgBh9GVsmNG",
      "object": "card",
      "status": null,
      "exp_month": 12,
      "exp_year": 2015,
      "last4": "0005",
      "country": "US",
      "type": null,
      "name": "VIAY KUMAR",
      "customer": "cus_6IrxhfwXNyD1Uw",
      "recipient": null,
      "address_line1": "140 2nd Street",
      "address_line2": "4th Floor",
      "address_zip": "94105",
      "address_city": "San Francisco",
      "address_state": "CA",
      "address_country": "USA",
      "address_zip_check": "pass",
      "address_line1_check": "pass",
      "cvc_check": "pass",
      "fingerprint": "TwjSA2KqPDhSMUvQ",
      "brand": "American Express",
      "funding": "credit"
    }

added same card again and got different card id but same finger print :-)

Request

{
  "source": {
    "number": "378282246310005",
    "cvc": "123",
    "address_line2": "4th Floor",
    "address_line1": "140 2nd Street",
    "address_country": "USA",
    "name": "VIAY KUMAR",
    "address_state": "CA",
    "exp_month": 12,
    "exp_year": 2015,
    "address_zip": "94105",
    "address_city": "San Francisco",
    "object": "card"
  }
}

Response

{
  "id": "card_166HKVC8Y8JrMFgBfvbHPgk2",
  "object": "card",
  "status": null,
  "exp_month": 12,
  "exp_year": 2015,
  "last4": "0005",
  "country": "US",
  "type": null,
  "name": "VIAY KUMAR",
  "customer": "cus_6IrxhfwXNyD1Uw",
  "recipient": null,
  "address_line1": "140 2nd Street",
  "address_line2": "4th Floor",
  "address_zip": "94105",
  "address_city": "San Francisco",
  "address_state": "CA",
  "address_country": "USA",
  "address_zip_check": "pass",
  "address_line1_check": "pass",
  "cvc_check": "pass",
  "fingerprint": "TwjSA2KqPDhSMUvQ",
  "brand": "American Express",
  "funding": "credit"
}