Get Segment Member Count
Get the current number of members in a segment. If there is no recent count, the API calculates a new count. The request waits until the count is complete.
Authentication
AuthorizationBearer
Authorization using a Mailchimp API key (a.k.a. Bearer token)
OR
AuthorizationBearer
Authorization using OAuth
Path parameters
segment_id
The unique id for the segment.
Response
count
The number of members that are in the segment now.