Group Membership Request

Property	Type	Description	Filter Group and Version	Available Version
`createdDate`	String	An ISO formatted date string specifying the date of the membership request	Big, 29.0	27.0
`id`	String	ID for the group membership request object	Small, 29.0	27.0
`lastUpdateDate`	String	An ISO formatted date string specifying the last time the request was updated	Small, 29.0	27.0
`requestedGroup`	Reference	Information about the group the user is requesting to join	Big, 29.0	27.0
`responseMessage`	String	A message to display to the user if their membership request is declined. The value of this property is used only when the value of the `status` property is `Declined`. The maximum length is 756 characters.	Big, 29.0	27.0
`status`	String	The status of the request to join a private group. Values are: `Accepted` `Declined` `Pending`	Small, 29.0	27.0
`url`	String	URL to this group membership request object	Small, 29.0	27.0
`user`	User Summary	Information about the user requesting membership in a group	Small, 29.0	27.0

Chatter REST API Developer Guide