Changes to Get clean message content

added the required property allOf[subschema #2]/data/body/cleaned_html to the response with the 200 status

added the required property allOf[subschema #2]/data/body/html_cleaning to the response with the 200 status

the allOf[subschema #2]/data response's property type changed from no type to object for status 200

removed MailboxMessageContent subschema #2 from the allOf[subschema #2]/data response property allOf list for the response status 200

added the required property allOf[subschema #2]/data/attachments to the response with the 200 status

added the required property allOf[subschema #2]/data/body to the response with the 200 status

added the required property allOf[subschema #2]/data/dates to the response with the 200 status

added the required property allOf[subschema #2]/data/headers to the response with the 200 status

added the required property allOf[subschema #2]/data/id to the response with the 200 status

added the required property allOf[subschema #2]/data/participants to the response with the 200 status

added the required property allOf[subschema #2]/data/states to the response with the 200 status

added the required property allOf[subschema #2]/data/subject to the response with the 200 status

added the required property allOf[subschema #2]/data/thread_id to the response with the 200 status

the endpoint scheme security oauth2 was added to the API

added the new optional query request parameter mailbox_id