The agent took the excess money after bargaining

Question
If someone asks me to buy a specific item for them, and I negotiate with the seller to lower the price, is it permissible for me to take the price of the item from the person who asked me to buy it at the original price before bargaining with the seller, and keep the excess for myself?
Answer
I say, and with God's help: this is betrayal and deception that contradicts the agent's duty of trust and honesty, and you are obliged to present it to the principal at the price you actually paid, and God knows best.
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