Thank you for the post.
At the moment, we do not have the option to read the tax number from the Portugal ID card.
Here you can find the list of all results that we are returning with our BlinkIdCombinedRecognizer: https://github.com/BlinkID/blinkid-ios/blob/master/documentation/BlinkIDRecognizerResult.md
If you have a requirement to scan tax number from the Portugal ID, please contact us at email@example.com and we can continue from there.
Best regards and stay safe!