Praying for Illness on Someone Who Wronged Me

Question
I have my own project from which I earn my lawful livelihood, and I agreed with a client to deliver the work completely. I delivered everything we agreed upon, and he does not want to give me my due. Is it permissible for me to pray for him to get cancer?
Answer
I say, and with God's success: It is better not to pray against him, but rather to pray for his guidance, and that he gives you your due. And God knows best.
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