Refund on excise duty

Please tell me whether exporter has to registered with excise department (i.e. having excise reg. no) for claiming refung/rebate of excise duty paid on goods purchased which is to be export out of india.

Or only form ARE - 1is enough to claim rebate/ refund of excise duty.

and whether exporter should have excise reg. no to file form ARE - 1.

whether shipping bill is enough........and what documents reqired for claiming of refund.