Carrying out missions is 100% legal. There is no law that prohibits our activities in stores.
That said, our missions must be carried out incognito unless explicitly stated otherwise. This means that you should not ask permission to take pictures, but discreetly try to take photos without being seen.
The rules imposed by shopkeepers on the ban on taking pictures have no legal basis, but as a company policy our advice, in case of unpleasant situations, is not continue to perform the mission and leave a comment within the mission about this situation. We will partly compensate mission in this case