Ruling on not refunding training course fees

Question:
May Allah bless you. The sister Umm Salih from al-Qassim says: I registered for a training course and paid the course fees before it started, but I decided to withdraw before it began. However, they refused to refund the amount I paid for the course, on the grounds that they had stipulated to me before payment that the paid amount is non-refundable. Is that permissible for them?

Answer:
Yes, the Prophet (peace and blessings be upon him) said: "Muslims are bound by their conditions, except a condition that makes the forbidden lawful or the lawful forbidden." So this is permissible. Yes.