Redemption of preference shares

Unlisted Public company have redeemed its preference shares .

Query :-

1)  We are filing SH-7 form ----(-is any othe forms we need to file ?

2) in SH-7 form -after redeemption -- Authorised and paid up capital both will get reduced or only issued , subscribed and paid up will get reduced ?

3) is stamp duty applicable ?

please suggest

Thanks in advance

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