public UnionPayCardBuilder smsCode(String smsCode) {
        if (TextUtils.isEmpty(smsCode)) {
            mSmsCode = null;
        } else {
            mSmsCode = smsCode;
        }
        return this;
    }
public UnionPayCardBuilder smsCode ( String smsCode ) { if ( TextUtils . isEmpty ( smsCode ) ) { mSmsCode = null ; } else { mSmsCode = smsCode ; } return this ; }
@param smsCode The auth code sent to the user via SMS.
@return {@link com.braintreepayments.api.models.UnionPayCardBuilder}