I've created custom fields to safe bank information. Now I want to modify the submitted data to encrypt the date to store it in the database.
But I can't modify the submitted data because the $data array is empty.
( The data the user submits is still saved to the database - but unmodified )
Sorry for the delay. The filter works for only default user fields, like user email and password. To change the value of custom fields before saving into the DB, please use the rwmb_field_id_value filter.