> ## Documentation Index
> Fetch the complete documentation index at: https://docs.vapify.agency/llms.txt
> Use this file to discover all available pages before exploring further.
# Understanding Sub Accounts
> What a sub account contains and how its four tabs fit together.
## Overview
A sub account is the isolated space for one client: its own users, assigned assistants, billing, and call logs. Every sub account's settings page has four tabs: **General**, **Assistants**, **Billing**, and **Users**.
## The four tabs
* **General**: sub account name, provider selection, and API keys. Once a Billing Start Date is set, provider API keys lock permanently.
* **Assistants**: which voice assistants (synced from your provider) are assigned to this client, plus the voice-widget permission toggle.
* **Billing**: Balance, Credits, per-minute pricing, monthly subscription, onboarding fee, and unprofitable-call protection.
* **Users**: who can log into this sub account, and their status (`invited`, `active`, `inactive`).
## Going live
"Going live" means setting the **Billing Start Date** (also shown as the Go Live Date). A one-time, permanent action — it cannot be changed once set. From that date forward, usage is billable, call logs begin syncing, and provider API keys lock. See [Launch Your Agency](/getting-started/launch-your-agency) for the full walkthrough.
Setting the Billing Start Date runs a live test call against your provider key. If the key is invalid, go-live is blocked with **"Please set a valid private key before you start billing."** Fix the key, then set the date.
Before the Billing Start Date is set, users can still log in, but call logs will not appear.
## Related Articles
* [Clients](/running-your-agency/clients): day-to-day sub account management tasks
* [How Vapify Works](/start-here/how-vapify-works): where sub accounts sit in the object hierarchy
* [How Billing Works](/billing/how-billing-works): Balance, Credits, and pricing in depth