Quotation על יבמות 99:2

To be his wife for all matters, for if he came to divorce her afterward, she does not need from him halitza rather a bill of divorce [get]. But money or a document do not have the effect of betrothing her from the Torah, rather from the Sages as they instituted an order, as they say in Yevamot. But (money or a document) do not finalize the betrothal to allow him to inherit from her or become impure for her and do not exempt from halitza, rather they make her forbidden to the other brothers.