Check your ledger. It will appear there if credited with a comment or description as 30 day challenge.
Ex :
Question
30 Day Challenge How do I check whether the Brokerage refund for 30 day challenge has been credited ?
How do I check whether the Brokerage refund for 30 day challenge has been credited ?
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the brokerage refund will be cerited in your fyers account before 10th of next month . you can check it in reports section