# Trigger SMS Challenge

To trigger a SMS challenge by sending SMS to user verified phone number containing a 6 digit one time password (OTP).

This OTP code can be used to clear a SMS challenge by using the Verify SMS endpoint.

{% admonition type="warning" %}
The Trigger SMS Challenge API is currently in closed Beta and subject to change. Please speak with your implementation manager if you would like to use this API.
{% /admonition %}

Endpoint: POST /v1/one-time-token/sms/trigger
Security: UserToken

## Header parameters:

  - `One-Time-Token` (string, required)
    Text value of a OTT.

## Response 200 fields (application/json):

  - `obfuscatedPhoneNo` (string)
    Obfuscated phone number that can be used as a hint for the end customer regarding which phone number the SMS was sent to.
    Example: "*********8888"