curl -X POST https://api.livchat.ai/v1/contacts/check \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "phones": ["5511999999999", "5511888888888"]
  }'

const response = await fetch("https://api.livchat.ai/v1/contacts/check", {
  method: "POST",
  headers: {
    Authorization: "Bearer YOUR_API_KEY",
    "Content-Type": "application/json",
  },
  body: JSON.stringify({
    phones: ["5511999999999", "5511888888888"],
  }),
});

const { data } = await response.json();

// Filter valid numbers
const validNumbers = data.users.filter(u => u.isInWhatsapp);

import requests

response = requests.post(
    "https://api.livchat.ai/v1/contacts/check",
    headers={
        "Authorization": "Bearer YOUR_API_KEY",
        "Content-Type": "application/json",
    },
    json={
        "phones": ["5511999999999", "5511888888888"],
    },
)

data = response.json()
valid_numbers = [u for u in data["data"]["users"] if u["isInWhatsapp"]]

{
  "success": true,
  "code": 200,
  "data": {
    "users": [
      {
        "query": "5511999999999",
        "isInWhatsapp": true,
        "jid": "5511999999999@s.whatsapp.net",
        "verifiedName": "Company Name"
      },
      {
        "query": "5511888888888",
        "isInWhatsapp": false,
        "jid": null,
        "verifiedName": ""
      }
    ]
  }
}