How to subscribe customers automacially on Klaviyo List via API?

Hi, I am selling some products and services and i am taking OptIn confirmation from customers to send them marketing emails and SMS.

Now when i create customer on Klaviyo and than use API “https://a.klaviyo.com/client/subscriptions?” they are still not subscribed to email and SMS Marketing. When i run above API,an email is sent to the customer to confirm the subscription.

Is there a way to automatically subscribe a customer to a particular list without sending a confirmation email to the customer?

Below is request body - 

{
  "data": {
    "type": "subscription",
    "attributes": {
      "profile": {
        "data": {
          "type": "profile",
          "attributes": {
            "email": "test@gmail.com",
            "phone_number": "+9797979"
          },
          "subscriptions": {
            "email": {
              "marketing": {
                "consent": "SUBSCRIBED"
              }
            },
            "sms": {
              "marketing": {
                "consent": "SUBSCRIBED"
              },
              "transactional": {
                "consent": "SUBSCRIBED"
              }
            },
            "whatsapp": {
              "marketing": {
                "consent": "SUBSCRIBED"
              },
              "transactional": {
                "consent": "SUBSCRIBED"
              }
            }
          }
        }
      }
    },
    "relationships": {
      "list": {
        "data": {
          "type": "list",
          "id": "Rt4K9n"
        }
      }
    }
  }
}