# Step up

 - [POST /v1/stepup/challenges/otp/{channel}](https://api.weavr.io/products/payment-run/openapi/step-up/stepupscachallenge.md): Initiates the step-up token process by sending an SMS with an one-time-password to a device belonging to the logged-in user that was previously enrolled through `/authentication_factors/otp/{channel}`
 - [POST /v1/stepup/challenges/otp/{channel}/verify](https://api.weavr.io/products/payment-run/openapi/step-up/stepupscaverify.md): Completes the verification process for a step up token. *Note that on the Sandbox Environment, text messages are not sent and the `verificationCode` is always "123456".*