# Enrol a user device for authentication using one-time passwords

This is the first step in enrolling the logged-in user's mobile device, where a one-time password is sent to the device.

_Note that on the Sandbox Environment, text messages are not sent and the one-time-password is always \"123456\"._

Endpoint: POST /v1/authentication_factors/otp/{channel}
Version: v1
Security: apiKey, authToken

## Path parameters:

  - `channel` (string, required)
    The unique identifier for the channel.
    Enum: "SMS"

## Response 400 fields (application/json):

  - `message` (string)
    When present helps to identify and fix the problem.

  - `syntaxErrors` (object)
    Is returned as part of an HTTP error response whenever a syntax error is detected. A list of the fields together with their syntax error will be provided.

  - `syntaxErrors.invalidFields` (array)

  - `syntaxErrors.invalidFields.params` (array)

  - `syntaxErrors.invalidFields.fieldName` (string)

  - `syntaxErrors.invalidFields.error` (string)
    Enum: "REQUIRED", "HAS_TEXT", "REQUIRES", "SIZE", "RANGE", "IN", "NOT_IN", "REGEX", "EXACTLY", "AT_LEAST", "AT_MOST", "ALL_OR_NONE"

## Response 403 fields (application/json):

  - `errorCode` (string)
    Enum: "INSUFFICIENT_PERMISSIONS"

## Response 404 fields (application/json):

  - `code` (string)

  - `message` (string)

## Response 409 fields (application/json):

  - `errorCode` (string)
    Enum: "CHANNEL_NOT_SUPPORTED", "CHANNEL_ALREADY_REGISTERED", "MOBILE_NUMBER_NOT_AVAILABLE", "MOBILE_NUMBER_INVALID", "MOBILE_COUNTRY_NOT_SUPPORTED", "CREDENTIALS_INACTIVE"

## Response default fields (application/json):

  - `code` (string)

  - `message` (string)


## Response 204 fields

## Response 401 fields

## Response 429 fields

## Response 500 fields

## Response 503 fields