Request URL
/api/v1/user/bulk

Method: GET
Query Param:
domainId: 55f45e0fbe33438f88447f1d338aae45

Request Headers:
authorization:Basic cmVhbGl6ZTp0ZXN0aW5nMTIzJA==
usernames: stimpy@gedu-demo-pearson.com,yak@gedu-demo-pearson.com