curl --request POST \
  --url https://sandbox.voice.miraiminds.co/v2/campaigns/{campaign_id}/contacts \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "contacts": [
    {
      "id": "lead-1043",
      "phone": "+919876501234",
      "variables": {
        "name": "अमित",
        "vehicle": "नेक्सॉन",
        "due_date": "22 अक्टूबर"
      }
    }
  ]
}
'

import requests

url = "https://sandbox.voice.miraiminds.co/v2/campaigns/{campaign_id}/contacts"

payload = { "contacts": [
        {
            "id": "lead-1043",
            "phone": "+919876501234",
            "variables": {
                "name": "अमित",
                "vehicle": "नेक्सॉन",
                "due_date": "22 अक्टूबर"
            }
        }
    ] }
headers = {
    "Authorization": "Bearer <token>",
    "Content-Type": "application/json"
}

response = requests.post(url, json=payload, headers=headers)

print(response.text)

const url = 'https://sandbox.voice.miraiminds.co/v2/campaigns/{campaign_id}/contacts';
const options = {
  method: 'POST',
  headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    contacts: [
      {
        id: 'lead-1043',
        phone: '+919876501234',
        variables: {name: 'अमित', vehicle: 'नेक्सॉन', due_date: '22 अक्टूबर'}
      }
    ]
  })
};

fetch(url, options)
  .then(res => res.json())
  .then(json => console.log(json))
  .catch(err => console.error(err));