> ## Documentation Index
> Fetch the complete documentation index at: https://docs.skyfree.io/llms.txt
> Use this file to discover all available pages before exploring further.
# Instance Config
> Set instance-wide fallback services and review worker capacity.
**Included with every self-managed instance.** This tab is part of [Whitelabel Setup](/self-host/whitelabel-setup/overview).
## What is this?
The **Instance Config** tab holds instance-wide settings that aren't tied to a specific cron job — a fallback email sender, a currency-conversion API, message-credit billing units, and a read-only status panel written by background processes. Changes here apply without a restart.
## What can I do here?
**Universal email fallback (SES)** — used when a platform has no email settings configured, or its primary provider fails:
* **Region** (e.g. `ap-south-1`)
* **Access key ID**
* **Secret access key**
* **From email**
* **Reply-to email**
**Currency conversion (FX rate API)** — base URL and key used for cross-currency conversion:
* **API base URL** (e.g. `https://open.er-api.com/v6/latest`)
* **API key**
**Message credit billing** — credit units consumed per stored message and status update:
* **Units per stored message**
* **Units per status update**
* **Billable statuses (comma separated)** — which WhatsApp status-update events (e.g. `sent, delivered, read, failed`) count toward billing.
* **Estimated updates per message**
**Read-only instance status** — written by background processes, cannot be edited here:
* **Worker heartbeat** — status, role, PID, and last-seen time of the background health worker.
* **Platform capacity records** — total messages sent all-time, peak combined throughput, and when it was last sampled.
Each of the three editable sections (SES, FX rate API, message credit billing) has its own independent **Save section** button.
## How to use it
1. Scroll to the **Universal email fallback (SES)** card and fill in your AWS SES **Region**, **Access key ID**, **Secret access key**, **From email**, and **Reply-to email**. Click **Save section** on that card to save just this section.
2. Scroll to the **Currency conversion (FX rate API)** card and enter the **API base URL** and **API key** for your exchange-rate provider. Click **Save section**.
3. Scroll to the **Message credit billing** card and set **Units per stored message**, **Units per status update**, **Billable statuses (comma separated)**, and **Estimated updates per message**. Click **Save section**.
4. Review the **Read-only instance status** card at the bottom to confirm the worker heartbeat is recent and check platform capacity numbers — these fields aren't editable and are for diagnostics only.
