@Override
    public String toString() {
        return TextUtils.join("|", new Object[] {
                responseCode, nonce, packageName, versionCode,
                userId, timestamp
        });
    }
Parses response string into ResponseData.

@param responseData response data string
@throws IllegalArgumentException upon parsing error
@return ResponseData object
android/android_framework/base/src/main/java/com/google/android/vending/licensing/ResponseData.java