post https://gateway.stage.bill.com/connect/v3/mfa/step-up
Set your current API session as MFA trusted.
Ideally, when you sign in with POST /v3/login, set rememberMeId and device in your request to generate an MFA-trusted API session.
In case you sign in without rememberMeId and device in your request, you can use this POST /v3/mfa/step-up endpoint to mark the current API session as MFA trusted.