added intentbased pg

src/main/java/com/billpaymentservice/bbps/util/Helper.java

@@ -177,5 +177,14 @@ public class Helper {
 	    user.setAge(request.getAge());
 	    return user;
 	}
+	
+	public <T> T convertJsonToObject(String json, Class<T> clazz) {
+	    try {
+	        return objectMapper.readValue(json, clazz);
+	    } catch (Exception e) {
+	        throw new CustomException("Invalid JSON from payment API", "FAILED", 400, json);
+	    }
+	}
+
 
 }