diff --git a/documents/iins.md b/documents/iins.md
new file mode 100644
index 0000000..5f6e9f9
--- /dev/null
+++ b/documents/iins.md
@@ -0,0 +1,106 @@
+### Iin
+
+### Token IIN API
+
+```js
+var tokenIin = "412345";
+instance.iins.fetch(tokenIin)
+```
+
+**Parameters:**
+
+| Name       | Type   | Description                       |
+|------------|--------|-----------------------------------|
+| tokenIin* | string | The token IIN. |
+
+**Response:**
+```json
+{
+  "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": "411111",
+  "emi":{
+     "available": true
+     },
+  "recurring": {
+     "available": true
+     },
+  "authentication_types": [
+   {
+       "type":"3ds"
+   },
+   {
+       "type":"otp"
+   }
+  ]
+}
+```
+-------------------------------------------------------------------------------------------------------
+
+### Fetch All IINs Supporting Native OTP
+
+```js
+var param = {"flow": "otp"}
+instance.iins.all(param)
+```
+
+**Response:**
+```json
+{
+  "count": 24,
+  "iins": [
+    "512967",
+    "180005",
+    "401704",
+    "401806",
+    "123456",
+    "411111",
+    "123512967",
+    "180012305",
+    "401123704"
+  ]
+}
+```
+-------------------------------------------------------------------------------------------------------
+
+### Fetch All IINs with Business Sub-type
+
+```js
+var param = {"sub_type": "business"}
+instance.iins.all(param)
+```
+
+**Response:**
+```json
+{
+  "count": 24,
+  "iins": [
+    "512967",
+    "180005",
+    "401704",
+    "401806",
+    "607389",
+    "652203",
+    "414367",
+    "787878",
+    "123456",
+    "411111",
+    "123512967",
+    "180012305",
+    "401123704"
+  ]
+}
+```
+-------------------------------------------------------------------------------------------------------
+
+**PN: * indicates mandatory fields**
+<br>
+<br>
+**For reference click [here](https://razorpay.com/docs/api/payments/cards/iin-api/#iin-entity)**
\ No newline at end of file
diff --git a/lib/resources/iins.js b/lib/resources/iins.js
index a6dc7a9..add028c 100644
--- a/lib/resources/iins.js
+++ b/lib/resources/iins.js
@@ -10,5 +10,12 @@ module.exports = function (api) {
                 url: `${BASE_URL}/${tokenIin}`,
             }, callback);
         },
+
+        all(params = {}, callback) {
+            return api.get({
+                url: `${BASE_URL}/list`,
+                data: params
+            }, callback)
+        },
     }
 }
\ No newline at end of file
diff --git a/lib/types/iins.d.ts b/lib/types/iins.d.ts
index f19cae9..0c8f970 100644
--- a/lib/types/iins.d.ts
+++ b/lib/types/iins.d.ts
@@ -93,6 +93,13 @@ export declare namespace Iins {
     | 'consumer'
     | 'business'
     | 'unknown'
+
+    type ListType = {flow: string;} | {sub_type: string;}
+
+    interface RazorpayIinList {
+        count: number; 
+        iins : string[];
+    }
 }
 
 declare function iins(api: any): {
@@ -104,6 +111,13 @@ declare function iins(api: any): {
     */
     fetch(tokenIin: string): Promise<Iins.RazorpayIin>
     fetch(tokenIin: string, callback: (err: INormalizeError | null, data: Iins.RazorpayIin) => void): void;
+    /**
+     * Fetch all IINs supporting `native otp` or `business sub-type`
+     * 
+     * @param params - Check [doc](https://razorpay.com/docs/api/payments/cards/iin-api/#fetch-all-iins-supporting-native-otp) for required params
+     */
+    all(params: Iins.ListType): Promise<Iins.RazorpayIinList>
+    all(params: Iins.ListType, callback: (err: INormalizeError | null, data: Iins.RazorpayIinList) => void): void;
 }
 
 export default iins
\ No newline at end of file