A Regional Level Guide licence is issued by the Ministry of Tourism after a written examination, an interview and a training course run through the Indian Institute of Tourism and Travel Management. It is issued for a tourism region, not for the whole country, and it names the foreign languages the holder is examined in.
Every licence card carries a photograph, a licence number, the issuing region and the languages the holder is examined in. We send a photograph of the card on WhatsApp when a booking is confirmed, before you pay anything, so you can check the number, the region and the language against the guide who meets you.
Archaeological Survey of India monuments admit licensed guides and turn away unlicensed ones at the ticket gate. An unlicensed "guide" who approaches you outside the Taj Mahal or Amber Fort cannot accompany you inside, which is why the pitch is always made in the car park.