ts for <code>CardBrand.unknown</code> cards in SDK, setup  <code><a href="Classes/VGSPaymentCards.html#/s:13VGSCollectSDK15VGSPaymentCardsC7unknownAA26VGSUnknownPaymentCardModelVvpZ">VGSPaymentCards.unknown</a></code> model attributes.</p>

                        <a href="Structs/VGSValidationRulePaymentCard.html" class="slightly-smaller">See more</a>
                      </div>
                      <div class="declaration">
                        <h4>Declaration</h4>
                        <div class=