Custom data with Passwordless SMS gateway

Feature: Ability to propagate custom data to the SMS gateway from the /passwordless/start API.

Description: Today, when forward_req_info is on, the only parameters being sent to the SMS gateway is the User Agent and Client IP. However, you don’t have the ability to set additional data that would be forwarded.

Use-case: We would like to have the ability to add some extra cusom data to the /passwordless/start call, that will be forwarded to the SMS gateway. This will allow us to implement CAPTCHA or other protection mechanisms on the SMS gateway.