docs: @Nullable
      public Card getCard() {
          if (validateAllFields()) {
              String cardNumber = mCardNumberEditText.getCardNumber();
              int[] cardDate = mExpiryDateEditText.getValidDateFields();
              String cvcValue = mCvcEditText.getText().toString();
  
              Card card = new Card(cardNumber, cardDate[0], cardDate[1], cvcValue);
              if (mShouldShowPostalCode) {
                  card.setAddressZip(mPostalCodeEditText.getText().toString());
              }
              return card.addLoggingToken(CARD_MULTILINE_TOKEN);
          }
  
          return null;
      }