OTP

Templates

Keep your SMS wording in templates, by API or on the Templates page of the console, and send by id.

GEThttps://api.siellabs.com/v1/templates

POSThttps://api.siellabs.com/v1/templates

GEThttps://api.siellabs.com/v1/templates/{id}

PUThttps://api.siellabs.com/v1/templates/{id}

DELETEhttps://api.siellabs.com/v1/templates/{id}

Body#

namestringRequired

Up to 80 characters, unique in your account.

bodystringRequired

The text. For OTPs, with {code} where the code goes; for messages, with {{variables}} such as {{first_name}}, filled when you send it.

categorystringOptional

Up to 40 characters, for you.

GET /v1/templates takes name: only templates whose name starts with it.

Send a template as a message with template_id and variables on POST /v1/messages or POST /v1/messages/batch, or as an OTP's text with template_id on POST /v1/verifications.

201 Created

{
  "id": "6d16aa9d-bf19-4141-8169-48b46d972fc6",
  "name": "Sign-up code",
  "category": "OTP",
  "body": "Your code is {code}",
  "created_at": "2026-11-02T09:15:02Z",
  "updated_at": "2026-11-02T09:15:02Z"
}

Errors: invalid_name, invalid_category, invalid_body, body_too_long (422), template_exists (409), not_found (404).