Possible to make the call "GetMemberMessages"

[benkraw]

Is it possible to make the API call to the "GetMemberMessages" end point.
This is the error I get:
{ '$': { xmlns: 'urn:ebay:apis:eBLBaseComponents' },
Timestamp: '2017-05-04 18:45:55',
Ack: 'Failure',
Errors:
{ ShortMessage: 'Unsupported API call.',
LongMessage: 'The API call "GetMemberMessagesRequest" is invalid or not supported in this release.',
ErrorCode: '2',
SeverityCode: 'Error',
ErrorClassification: 'RequestError' },
Version: '775',
Build: '18007281' }

Params I am using:

params: {
"WarningLevel":"High",
"MailMessageType":"All",
"Pagination":{
"EntriesPerPage":"100",
"PageNumber":"1"
}
}