> ## Documentation Index
> Fetch the complete documentation index at: https://razorpay-60c89f9a-mintlify-audit-missing-sections-1778528421.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# IIN/BIN Validations on Tokens

> **WARN**

**Watch Out**

* As per RBI guidelines, businesses and payment acquirers are allowed to save the last 4 card digits and the Bank Identification Number (BIN) only.
* As per current interpretation, businesses and Payment Acquirer are not allowed to save the Issuer Identification Number (IIN) of the card.\*

\*Razorpay is seeking clarification on this from the industry and RBI.

## Token IIN API

A token is an alias or surrogate value for the actual card number. Whenever the network tokenises a card, the token generated will be a numeric value with the same length as the actual card number.

#### For Example

## Card Number | Token

4386 2894 0766 0153 | 4123 4511 1111 1117

When a card is tokenised, the first 6 digits or the IIN of the card gets changed.
The new IIN for the card is referred to as token IIN.

Use the following API to fetch the properties of the card using token IIN.

/iins/:token\_iin

#### Path Parameter

`token_iin` *mandatory*
: `integer` The token IIN.

````curl: Curl theme={null}
curl -u [YOUR_KEY_ID]:[YOUR_KEY_SECRET]
-X GET https://api.razorpay.com/v1/iins/412345
-H "content-type: application/json"

```java: Java
RazorpayClient razorpay = new RazorpayClient("[YOUR_KEY_ID]", "[YOUR_KEY_SECRET]");

String tokenIin = "412345";

Iin token = instance.iin.fetch(tokenIin);

```php: PHP
$api = new Api($key_id, $secret);

$tokenIin = "412345";
$api->iin->fetch($tokenIin);

```go: Go
import ( razorpay "github.com/razorpay/razorpay-go" )
client := razorpay.NewClient("YOUR_KEY_ID", "YOUR_SECRET")

tokenIin := "412345"

body, err := client.Iin.Fetch(tokenIin, nil, nil)

```javascript: Node.js
var instance = new Razorpay({ key_id: 'YOUR_KEY_ID', key_secret: 'YOUR_SECRET' })

var tokenIin = "412345";

instance.iins.fetch(tokenIin);

```csharp: .NET
RazorpayClient client = new RazorpayClient("[YOUR_KEY_ID]", "[YOUR_KEY_SECRET]");

string tokenIin = "412345";

Iin iin = client.Iin.Fetch(tokenIin);

```json: Response
{
  "iin": "412345",
  "entity": "iin",
  "network": "Visa",
  "type": "credit",
  "sub_type": "business",
  "issuer_code": "HDFC",
  "issuer_name": "HDFC Bank Ltd",
  "international": false,
  "is_tokenized": true,
  "card_iin": "438628",
  "emi":{
     "available": true
     },
  "recurring": {
     "available": true
     },
  "authentication_types": [
   {
       "type":"3ds"
   },
   {
       "type":"otp"
   }
  ]
}
````

### Related Information

* [Fetch Card IIN Information API](/api/payments/cards/iin-api)