8 – How to change the value of a user field through Restfull?

Assuming the user rest resource is enabled and PATCH requests are configured, also that the requesting user is authenticated to update the user, then:

send a PATCH request to: https://example.com/user/$uid?_format=json

Where $uid is the user id to update (e.g 12)

The request body should look something like this (json format):

{ "field_motherid":
    {"value": "new_value"}