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

# Update card OTP phone

> Update the OTP phone number for a virtual card.

Updates the phone number used for OTP authentication on card transactions. Requires an API key with access level 2 or higher.

## Path parameters

<ParamField path="cardId" type="string" required>
  Card identifier.
</ParamField>

## Body

<ParamField body="phone_country_code" type="integer">
  Phone country code.
</ParamField>

<ParamField body="phone" type="string">
  Phone number without country code.
</ParamField>

## Response

Returns HTTP 200 with an empty body on success.

<RequestExample>
  ```bash cURL theme={null}
  curl -X PUT "https://api.cryptomate.me/cards/virtual-cards/card_6f1e2a30-4a3c-4b2e-9a1d-5e8c9b7a1f23/phone" \
    -H "x-api-key: $CRYPTOMATE_API_KEY" \
    -H "Content-Type: application/json" \
    -d '{
      "phone_country_code": 1,
      "phone": "5551234567"
    }'
  ```
</RequestExample>

<ResponseExample>
  ```json 200 OK theme={null}
  {}
  ```
</ResponseExample>