curl --request POST \
  --url https://app.thinnest.ai/api/v1/customers \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "name": "Sunrise Dental Clinic",
  "externalId": "clinic-0042",
  "metadata": {
    "city": "Pune",
    "tier": "gold",
    "seats": 3
  },
  "timezone": "Asia/Kolkata"
}
'

const options = {
  method: 'POST',
  headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    name: 'Sunrise Dental Clinic',
    externalId: 'clinic-0042',
    metadata: {city: 'Pune', tier: 'gold', seats: 3},
    timezone: 'Asia/Kolkata'
  })
};

fetch('https://app.thinnest.ai/api/v1/customers', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

import requests

url = "https://app.thinnest.ai/api/v1/customers"

payload = {
    "name": "Sunrise Dental Clinic",
    "externalId": "clinic-0042",
    "metadata": {
        "city": "Pune",
        "tier": "gold",
        "seats": 3
    },
    "timezone": "Asia/Kolkata"
}
headers = {
    "Authorization": "Bearer <token>",
    "Content-Type": "application/json"
}

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

print(response.text)

{
  "id": "org_5b2f9c1e-8a4d-4f7b-9e3a-2c6d1f0a7b84",
  "name": "Sunrise Dental Clinic",
  "externalId": "clinic-0042",
  "metadata": {
    "city": "Pune",
    "tier": "gold",
    "seats": 3
  },
  "timezone": "Asia/Kolkata",
  "allottedCallLines": null,
  "archivedAt": null,
  "eraseAfter": null,
  "createdAt": "2026-10-06T09:30:12.881Z"
}

{
  "error": "`externalId` is your own id for this customer: 1-128 letters, digits, `.`, `_`, `:` or `-`."
}

{
  "error": "Send a valid API key as `Authorization: Bearer <key>`."
}

{
  "error": "This plan includes 3 customers. Upgrade to add more, or delete one you no longer need."
}

{
  "error": "This API key is read-only: it can read everything but change nothing."
}

{
  "error": "A customer with externalId `clinic-0042` already exists."
}

{
  "error": "Over 240 requests a minute. Slow down and retry."
}