What is required by a courier person, Transport ID or GST or both

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One of my friend who is a courier delivery boy and who also collects courier material and later give them bills is pressurized for GST by some companies.
I have got my own GST and in that instance have applied for him and it got finally rejected.
Later one of the customers asked him to get Transporter Id and we could get it done instantly.
Now the question is does these courier people require only a transporter id or gst or both.

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