import { PeriskopeApi } from '@periskope/periskope-client';

const client = new PeriskopeApi({
  authToken: 'YOUR_API_KEY',
  phone: 'YOUR_PHONE_NUMBER', // e.g., '919876543210'
});

async function checkContact() {
  const response = await client.contact.checkExists({
    contact_ids: ['919537851844', '919876543210']
  });

  console.log(response);
}

checkContact();

curl -X POST \
  https://api.periskope.app/v1/contacts/check \
  -H 'Authorization: Bearer <token>' \
  -H 'Content-Type: application/json' \
  -H 'x-phone: YOUR_PHONE_NUMBER' \
  -d '{
    "contact_ids": ["919537851844", "919876543210"]
  }'

[
  {
    "contact_id": "919537851844@c.us",
    "exists": true
  },
  {
    "contact_id": "919876543210@c.us",
    "exists": false
  }
]