curl --request PATCH \
  --url https://api.onswitch.xyz/wallet/{wallet_id} \
  --header 'Content-Type: application/json' \
  --header 'x-service-key: <api-key>' \
  --data '
{
  "callback_url": "https://your-app.com/webhook"
}
'

{
  "success": true,
  "message": "Wallet updated successfully",
  "timestamp": "2024-01-01T00:00:00.000Z",
  "data": {
    "id": "699a6555fd4cab59e6175f79",
    "name": "My Wallet",
    "address": {
      "Base": "0x1234567890123456789012345678901234567890",
      "Solana": "..."
    },
    "callback_url": "https://your-app.com/webhook"
  }
}