curl --request POST \
  --url https://api.fourthwall.com/open-api/v1.1/memberships/series/posts \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "title": "<string>",
  "postsType": "video",
  "description": "<string>",
  "coverImageResourceId": 123,
  "thumbnailResourceId": 123,
  "postsIds": [
    123
  ]
}
'

{
  "id": 123
}