{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://raw.githubusercontent.com/api-evangelist/gov-uk-notify/main/json-schema/send-sms-request.json",
  "title": "Send SMS Request",
  "description": "Request body for sending an SMS notification via the GOV.UK Notify API.",
  "type": "object",
  "required": ["phone_number", "template_id"],
  "properties": {
    "phone_number": {
      "type": "string",
      "description": "UK mobile phone number of the recipient. E.164 format recommended.",
      "example": "+447900900123"
    },
    "template_id": {
      "type": "string",
      "format": "uuid",
      "description": "UUID of the SMS template to use."
    },
    "personalisation": {
      "type": "object",
      "additionalProperties": { "type": "string" },
      "description": "Key-value pairs to fill placeholders in the template."
    },
    "reference": {
      "type": "string",
      "description": "Client-supplied unique reference string for this notification."
    },
    "sms_sender_id": {
      "type": "string",
      "format": "uuid",
      "description": "UUID of an SMS sender configured on the service. Overrides service default."
    }
  },
  "additionalProperties": false
}