POST call to the Create a User endpoint. Be sure to replace MGMT_API_ACCESS_TOKEN, CONNECTION_NAME, EMAIL_VALUE, PASSWORD_VALUE, GIVEN_NAME_VALUE, FAMILY_NAME_VALUE, NAME_VALUE, NICKNAME_VALUE, and PICTURE placeholder values with your Management API , initial connection name, email address, password, given name, family name, name, nickname, and picture URL, respectively.
If you are using Lock or the public signup endpoint for user sign-up, you can set root attributes using the same method.