Afghanistan - In what circumstance are Afghan nations permitted to reside and/or work in Iran? If an Afghan national cannot afford to pay for the cost of renewal of his residency card in Iran, does he lose any residency right he might have previously been granted? Is it possible for an Afghan national to acquire the right to Iranian citizenship through naturalisation?

https://www.ecoi.net/en/file/local/1442114/4792_1535712665_144361.pdf