adding users when the device is set to use remote LDAP authentication

I have a power shell script to add users to a device. The device is set to use remote ldap authentication. When creating users through the GUI, i am only required to provide username, partition, role and shell access. My question is, how should i handle this through the script? It throws and exception if i don't pass a value for the password, so i am currently just passing a generic password which seems to work, but I want to do it the right way. I am using the create_user_3 method and UserInfo3.