> ## Documentation Index
> Fetch the complete documentation index at: https://docs.x402x.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Server responses

> Return structures for process/parse/verify/settle

## process()

```ts theme={null}
type ProcessResult =
  | { success: true; status: 200; data: { payer: string; txHash: string } }
  | { success: false; status: 402; errorStage: "parse" | "verify"; response: Response402 }
  | { success: false; status: 500; errorStage: "settle"; response: Response402; error: string };
```

## Steps

* parse: parsing failed → 402
* verify: verification failed → 402
* settle: settlement failed → 500 (typically chain/network issues)

## Other return types

```ts theme={null}
// parse()
type ParseResult =
  | { success: true; data: ParsedPayment }
  | { success: false; response402: Response402 };

// verify()
type VerifyResult =
  | { success: true; payer: string }
  | { success: false; error: string };

// settle()
type SettleResult =
  | { success: true; txHash: string; network: string }
  | { success: false; error: string };

// initialize()
type InitResult =
  | { success: true; detected?: number; total?: number }
  | { success: false; error: string };
```

## Example: unified handling

```ts theme={null}
const result = await server.process(header, requirements);
if (result.success) {
  res.json({ payer: result.data.payer, txHash: result.data.txHash });
} else {
  res.status(result.status).json(result.response);
}
```