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Yes, you will require ID proof and passport size photos. The permit can be obtained from Sikkim tourism department in Gangtok.
Have a look at this article by Vishakha Shrivastava https://www.tripoto.com/sikkim/trips/nathula-pass-permit-cost
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You need an ID proof. follow the link below this will help you.
https://www.tripoto.com/sikkim/trips/nathula-pass-permit-cost
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