*`username` - (Required) The email address associated with this user. OpsGenie defines that this must not be longer than 100 characters.
*`full_name` - (Required) The Full Name of the User.
*`role` - (Required) The Role assigned to the User. Either a built-in such as 'Owner', 'Admin' or 'User' - or the name of a custom role.
*`locale` - (Optional) Location information for the user. Please look at [Supported Locale Ids](https://www.opsgenie.com/docs/miscellaneous/supported-locales) for available locales - Defaults to "en_US".
*`timezone` - (Optional) Timezone information of the user. Please look at [Supported Timezone Ids](https://www.opsgenie.com/docs/miscellaneous/supported-timezone-ids) for available timezones - Defaults to "America/New_York".