> ## Documentation Index
> Fetch the complete documentation index at: https://arcpay-somnia.vercel.app/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# Invoices

> Create and settle STT or SOMUSD invoices on Somnia.

ArcPay invoices give agent businesses a normal client billing workflow while keeping settlement evidence on Somnia.

## Supported Tokens

* `STT`
* `SOMUSD`

## Flow

1. Operator creates invoice metadata in the ArcPay workspace.
2. App derives `invoiceId = keccak256(publicInvoiceId)`.
3. Operator calls `AgentInvoiceBook.createInvoice`.
4. Payer signs `payNativeInvoice` for STT or approves SOMUSD then calls `payTokenInvoice`.
5. Operator can sync status from Somnia and export audit evidence.

## Contract

```text theme={null}
AgentInvoiceBook: 0x643De19f32B1d0c396Cf8B5cD677549c442Fbbf7
SOMUSD: 0x02b8316775057e2096471473663d51ceafbe3e3b
```

## CLI

```bash theme={null}
npm run arcpay -- invoice-id inv_001
npm run arcpay -- invoice-guide
```

## Product Screen

<img src="https://mintcdn.com/csi-58c5959c/sfarsYsF0PcRgbvc/images/invoices.png?fit=max&auto=format&n=sfarsYsF0PcRgbvc&q=85&s=b4f6e811d693f9b81f812cb39ad2bd77" alt="ArcPay invoices dashboard" width="1440" height="1100" data-path="images/invoices.png" />