Selling alcohol to kaafirs

Rewards for donating blood

His father asks him to buy cigarettes for him

Selling a mobile phone for which the purchaser pays in installments, from which the vendor pays for the “smart card”

Bay’ al-Wafaa’

Selling perfume to non-Muslim women

Is it permissible for people taking part in an auction to ask someone present not to increase the price?

A vendor imposed a condition that a prospective purchaser has to pay him some compensation if he does not buy

Selling on consignment and selling a product before it arrives

Selling haraam and doubtful things