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

# Update VA Callback URL

> Set the URL that Holdstation Pay calls when a Virtual Account payment is received.

Update the callback URL that Holdstation Pay uses to notify the partner of payments received on their virtual accounts.

See [Virtual Account](/guides/partner-merchant-virtual-account/virtual-account#payment-callback) for the callback payload and verification.

## Authentication

<ParamField header="Partner-App-Key" type="string" required>
  Your partner app key.
</ParamField>

<ParamField header="X-HSPay-Signature" type="string" required>
  Base64-encoded Ed25519 signature of the sign data.
</ParamField>

<ParamField header="X-HSPay-Timestamp" type="string" required>
  Unix timestamp (seconds) of the request. Must be within 60 seconds of server time.
</ParamField>

## Body Parameters

<ParamField body="va_callback" type="string" required>
  HTTPS URL to receive Virtual Account payment callbacks.
</ParamField>

<RequestExample>
  ```json Request theme={null}
  {
    "va_callback": "https://partner.example.com/va/callback"
  }
  ```
</RequestExample>

<ResponseExample>
  ```json 200 theme={null}
  {
    "va_callback": "https://partner.example.com/va/callback"
  }
  ```
</ResponseExample>