curl --request POST \
  --url https://sandbox.voice.miraiminds.co/v2/dnc \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "phone": "+919812345678"
}
'

import requests

url = "https://sandbox.voice.miraiminds.co/v2/dnc"

payload = { "phone": "+919812345678" }
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/dnc';
const options = {
  method: 'POST',
  headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
  body: JSON.stringify({phone: '+919812345678'})
};

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

{
  "object": "dnc_entry",
  "phone": "+919812345678",
  "added": false
}

{
  "object": "dnc_entry",
  "phone": "+919812345678",
  "added": true
}

{
  "error": {
    "code": "invalid_request",
    "message": "phone must be an E.164 phone number, got '9812345678'"
  }
}