Need to add Our own unique coupon codes to be sent

Hello Team,

Need to add Our own unique coupon codes to be sent instead of plugin random unique codes,
And for one spin for one email, where one customer can claim one gift by only once entering email id. So if we adding smart watch in gift up to 1000 customers can get smart watch where each should have different unique id. So we need to need to add Our own unique coupon codes to be sent instead of plugin random unique codes.