Add New Domain in Windows Exchange Server 2013 With PHP

Question

I am using windows exchange server 2013 on windows server 2012.I am using PHP api reference: PHP Exchange Web Services

My project requirement is: register domain/email online with PHP api verify domain if exists then register a new domain/email.

i have add new domain in UPN and its shows new domain in list of new mailboxes.

my query is

1. how to add new domain with PHP api?
2. which domain is required in exchange server 2013? Active directory domain or accepted domains?