[CEPF-1750]: Added fetch payment methods endpoint

documents/payment.md

@@ -775,7 +775,7 @@ please refer this [doc](https://razorpay.com/docs/payments/third-party-validatio
 ```java
 RazorpayClient instance  = new RazorpayClient("key",""); // Use only razorpay key
 
-Methods response = instance.payments.get("methods",null);
+Methods methods = instance.payments.fetchPaymentMethods();
 ```
 
 **Response:** <br>

src/main/java/com/razorpay/Constants.java

@@ -39,7 +39,7 @@ public class Constants {
   static final String PAYMENT_CREATE_UPI = "payments/create/upi";
   static final String VALIDATE_VPA = "payments/validate/vpa";
 
-  static final String FETCH_PAYMENT_METHODS = "methods";
+  static final String METHODS = "methods";
 
   static final String PAYMENTLINK_CREATE = "payment_links";
   static final String PAYMENTLINK_LIST = "payment_links";

src/main/java/com/razorpay/PaymentClient.java

@@ -122,4 +122,7 @@ public Payment validateUpi(JSONObject request) throws RazorpayException {
   public Payment expandedDetails(String id, JSONObject request) throws RazorpayException {
     return get(Constants.VERSION, String.format(Constants.PAYMENT_GET, id), request);
   }
+  public Methods fetchPaymentMethods() throws RazorpayException {
+    return get(Constants.VERSION, Constants.METHODS, null);
+  }
 }

src/test/java/com/razorpay/PaymentClientTest.java

@@ -999,4 +999,48 @@ public void expandedDetails() throws RazorpayException {
             assertTrue(false);
         }
     }
+
+    @Test
+    public void fetchPaymentMethods() throws RazorpayException {
+        String mockedResponseJson = "{\n" +
+                "    \"entity\": \"methods\",\n" +
+                "    \"card\": true,\n" +
+                "    \"debit_card\": true,\n" +
+                "    \"credit_card\": true,\n" +
+                "    \"prepaid_card\": true,\n" +
+                "    \"card_networks\": {},\n" +
+                "    \"card_subtype\": {},\n" +
+                "    \"amex\": false,\n" +
+                "    \"netbanking\": {},\n" +
+                "    \"wallet\": [],\n" +
+                "    \"emi\": false,\n" +
+                "    \"upi\": true,\n" +
+                "    \"cardless_emi\": [],\n" +
+                "    \"paylater\": [],\n" +
+                "    \"google_pay_cards\": false,\n" +
+                "    \"app\": {},\n" +
+                "    \"gpay\": false,\n" +
+                "    \"emi_types\": {},\n" +
+                "    \"debit_emi_providers\": {},\n" +
+                "    \"intl_bank_transfer\": [],\n" +
+                "    \"fpx\": [],\n" +
+                "    \"nach\": false,\n" +
+                "    \"cod\": false,\n" +
+                "    \"offline\": false,\n" +
+                "    \"sodexo\": false,\n" +
+                "    \"upi_config\": [],\n" +
+                "    \"recurring\": {},\n" +
+                "    \"upi_intent\": true\n" +
+                "}";
+
+        try {
+            mockResponseFromExternalClient(mockedResponseJson.toString());
+            mockResponseHTTPCodeFromExternalClient(200);
+            Methods fetch = paymentClient.fetchPaymentMethods();
+            assertNotNull(fetch);
+            assertEquals("methods", fetch.get("entity"));
+        } catch (IOException e) {
+            assertTrue(false);
+        }
+    }
 }