Process of khula'

Khula is where the wife gives some money or her mahr to her husband and requests him to let her go in exchange for that money. Alternatively, she could ask him to let her go in exchange for the mahr that he is still owing her. Thereafter, in response to her request, the husband says: "I let you go," or "I give you khula." In saying so, one talaaqul baa'in takes place. The man does not have the right to keep her back or to revoke his divorce.

And Allah Ta'ala (الله تعالى) knows best.