curl --request PATCH \
  --url https://api.telli.com/v1/update-contacts-batch \
  --header 'Authorization: <api-key>' \
  --header 'Content-Type: application/json' \
  --data '{
  "contacts": [
    {
      "contact_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
      "first_name": "<string>",
      "last_name": "<string>",
      "phone_number": "<string>",
      "contact_details": {},
      "salutation": "<string>",
      "email": "[email protected]",
      "timezone": "<string>",
      "external_contact_id": "<string>"
    }
  ]
}'

[
  {
    "contact_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "status": "success",
    "error": "<string>"
  }
]