Is it permissible to sell products to wedding halls, knowing that the company concludes contracts with them, and is it permissible to grant discounts to customers who do not deserve them by entering the invoice in the name of another customer who does deserve the discount?

It is permissible to sell soft drinks to wedding halls, but it is not permissible to deduct their price for customers other than those specified by the company, because the seller is an agent for the company and does not have the authority to act except with its permission; otherwise, he guarantees the deficiency in the price.