The Third Geneva Convention calls for all POWs to receive a monthly allowance from their captors, separate from anything they may be paid for working while imprisoned, “to enable prisoners to improve their lot during captivity, but subject to reimbursement by” their own country. (1960 commentary)
A parenthetical remark in Tolstoy’s 1869 novel War and Peace that a Russian character captured by the French in 1812 “received the allowance of three rubles a week made to officers” (Part 13, Chapter 12) suggests that this was a practice that long predated the Geneva Conventions. Therefore conflicts and detainees to which the Geneva Conventions might not apply are still within the scope of this question.
Are POWs paid by their captors today? If so, by which countries? If not, when and why did it stop? Every time I try to google this, I find only results for whether POWs accumulate pay due them from their own country.