What is the ruling on taking payment for ruqyah, and is it permissible to set a fixed fee for it, and is the one performing ruqyah sinful if healing does not occur?

It is permissible to take compensation and a fee for ruqyah (exorcism/healing) using the Quran and legitimate supplications. This is the most deserving thing for which a fee can be taken, based on the hadith of Ibn Abbas: "Indeed, the most deserving thing for which you take a fee is the Book of Allah." It is permissible to stipulate compensation before the ruqyah, and jurists have agreed on its permissibility. As for the entitlement to the fee in the event of non-recovery, it depends on the condition agreed upon between the reciter (raqi) and the patient. If the reciter stipulates taking the fee regardless of the outcome, it is permissible. And if the patient stipulates payment only upon recovery, that is also permissible. While taking a fee is permissible, it is preferable for the ruqyah to be performed for the sake of Allah Almighty.