OptionalContextOptionalIdentifierThe identifier to get messages for - an email address, mailbox ID, in the case of SMS, could be a phone number. In the case of other systems could be a User ID for FB Messenger/WhatsApp, etc.
This is optional if the provider supports getting messages based on credentials alone as some credentials/providers can be scoped to a specific mailbox/user.
OptionalIncludeOptional, include the headers in the response (defaults to false)
The number of messages to return
OptionalUnreadOptional. If true, only messages not marked as read will be returned
Optional, any provider-specific parameters that are needed to get messages