class CardNumberEditText extends StripeEditText {

    @Nullable
    public String getCardNumber() {
        return mIsCardNumberValid
                ? StripeTextUtils.removeSpacesAndHyphens(getText().toString())
                : null;
    }

    public  CardNumberEditText(Context context);
    public  CardNumberEditText(Context context, AttributeSet attrs);
    public  CardNumberEditText(Context context, AttributeSet attrs, int defStyleAttr);

}