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

# Upsert Payment Details

> Create or update the seller's bank account details.

Upserts the seller's payment details and returns the full seller object.

## Path parameters

<ParamField path="id" type="string" required>
  The seller's ID.
</ParamField>

## Body parameters

<ParamField body="country_code" type="string">Bank country code.</ParamField>
<ParamField body="holder_name" type="string">Account holder name.</ParamField>
<ParamField body="bank_name" type="string">Bank name.</ParamField>
<ParamField body="iban" type="string">IBAN.</ParamField>
<ParamField body="bic" type="string">BIC / SWIFT code.</ParamField>
<ParamField body="routing_number" type="string">Routing number.</ParamField>
<ParamField body="account_number" type="string">Account number.</ParamField>
<ParamField body="additional_data" type="object">Custom data passed to workflow hooks.</ParamField>

## Query parameters

<ParamField query="fields" type="string">
  Comma-separated fields to include in the response.
</ParamField>

## Response

<ResponseField name="seller" type="object">
  <Expandable title="properties">
    <ResponseField name="id" type="string">The seller's ID.</ResponseField>
    <ResponseField name="payment_details" type="object">The updated payment details.</ResponseField>
  </Expandable>
</ResponseField>

<RequestExample>
  ```bash cURL theme={null}
  curl -X POST 'http://localhost:9000/vendor/sellers/sel_01HXYZ/payment-details' \
    -H 'Authorization: Bearer <token>' \
    -H 'x-seller-id: <seller_id>' \
    -H 'Content-Type: application/json' \
    -d '{"holder_name": "Acme Inc.", "iban": "DE89370400440532013000", "bic": "COBADEFFXXX"}'
  ```

  ```ts JS Client theme={null}
  const { seller } = await client.vendor.sellers.$id.paymentDetails.mutate({
    $id: "sel_01HXYZ",
    holder_name: "Acme Inc.",
    iban: "DE89370400440532013000",
    bic: "COBADEFFXXX",
  })
  ```
</RequestExample>

<ResponseExample>
  ```json 200 theme={null}
  {
    "seller": {
      "id": "sel_01HXYZ",
      "name": "Acme Store",
      "payment_details": {
        "holder_name": "Acme Inc.",
        "iban": "DE89370400440532013000",
        "bic": "COBADEFFXXX"
      }
    }
  }
  ```
</ResponseExample>