What is the ruling on the work of a purchasing agent who increases the price by 30% while submitting three fictitious price quotes, and what is the ruling on taking a commission from the seller with his consent?

If the company purchases goods at a certain price, then sells them at three different prices varying according to the payment period, there is no harm in that, provided that the contract is concluded at a single price. As for what the agent receives as a commission or gifts from the seller, it is not permissible for him to take them for himself; rather, he must return them to the company or seek its permission to take them.