curl -X POST https://api.box.com/2.0/collaborations \
     -H 'Authorization: Bearer <ACCESS_TOKEN>'
     -H 'Content-Type: application/json" '
     -d '{
       "item": {
         "type": "file",
         "id": "11446498"
       },
       "accessible_by": {
         "type": "user",
         "login": "123456"
       },
       "role": "editor"
     }'

// collaborate folder 11111 with user 22222
BoxCollaborationRequest requestParams = new BoxCollaborationRequest()
{
    Item = new BoxRequestEntity()
    {
        Type = BoxType.Folder,
        Id = "11111"
    },
    Role = "editor",
    AccessibleBy = new BoxCollaborationUserRequest()
    {
        Id = "22222"
    }
};
BoxCollaboration collab = await client.CollaborationsManager.AddCollaborationAsync(requestParams);

BoxCollaborator user = new BoxUser(api, "user-id")
BoxFolder folder = new BoxFolder(api, "folder-id");
folder.collaborate(user, BoxCollaboration.Role.EDITOR);

from boxsdk.object.collaboration import CollaborationRole

user = client.user(user_id='11111')
collaboration = client.folder(folder_id='22222').collaborate(user, CollaborationRole.VIEWER)

collaborator = collaboration.accessible_by
item = collaboration.item
has_accepted = 'has' if collaboration.status == 'accepted' else 'has not'
print('{0} {1} accepted the collaboration to folder "{2}"'.format(collaborator.name, has_accepted, item.name))

// Invite user 123456 to collaborate on folder 987654
client.collaborations.createWithUserID('123456', '987654', client.collaborationRoles.EDITOR)
	.then(collaboration => {
		/* collaboration -> {
			type: 'collaboration',
			id: '11111',
			created_by: 
			{ type: 'user',
				id: '22222',
				name: 'Inviting User',
				login: 'inviter@example.com' },
			created_at: '2016-11-16T21:33:31-08:00',
			modified_at: '2016-11-16T21:33:31-08:00',
			expires_at: null,
			status: 'accepted',
			accessible_by: 
			{ type: 'user',
				id: '123456',
				name: 'Collaborator User',
				login: 'collaborator@example.com' },
			role: 'editor',
			acknowledged_at: '2016-11-16T21:33:31-08:00',
			item: 
			{ type: 'folder',
				id: '987654',
				sequence_id: '0',
				etag: '0',
				name: 'Collaborated Folder' } }
		*/
	});

client.collaborations.create(
    itemType: "folder",
    itemId: "22222",
    role: .editor,
    accessibleBy: "33333",
    accessibleByType: "user"
) { (result: Result<Collaboration, BoxSDKError>) in
    guard case let .success(collaboration) = result else {
        print("Error creating collaboration")
        return
    }

    print("Collaboration successfully created")
}