---
agentTools:
  projectIndex: https://developer.bill.com/llms.txt
---

# v3 API MFA-related improvements

An MFA ID is generated when you set `rememberMe` as `true` in your `POST /v3/mfa/challenge/validate` request.

To create a new MFA-trusted API session, you can now set an MFA ID and device name in your API login (`POST /v3/login`) request. In addition, BILL partners can create a new MFA-trusted API session by setting an MFA ID and device name in the API login as user (`POST /v3/partner/login-as-user`) request.

See [POST /v3/login](https://developer.bill.com/v3/reference/login) and [POST /v3/partner/login-as-user](https://developer.bill.com/v3/reference/loginasuser) in the API reference for more information.