class="summary"><li>Determines if credit card is valid using the Luhn formula.</li></ul></li><li class="sortli listnum8"><a href="#getCreditCardProvider">getCreditCardProvider</a><span class="typeInfo"> (cardNumber:String) : String</span><ul class="summary"><li>Determines US credit card provider by card number.</li></ul></li></ul></div></div></div><div class="memberSection"><h2 id="Classmethods">Class methods</h2><div class="member" id="contains"><h3>contains</h3><div class="fullMemberString"><div class="fl