LoungeKey™ is a Curve Metal benefit that you can read more about here. To enter an eligible airport lounge, you’ll need to present your physical Curve Metal card.
However, your Curve Metal Digital card allows you to take full advantage of all other Curve Metal subscription perks such as Worldwide Travel, Phone, and Rental Card Collision Waiver Insurance, but also unlimited access to interbank FX rates.
You won't be charged for your first Curve Metal card, but any subsequent reissues may incur a 50 GBP/EUR fee, as per our Terms of Service (see here - section 14.2). This amount covers the cost of replacing your card.