curl --request PUT \
  --url https://api.fourthwall.com/open-api/v1.1/memberships/series/posts/{id} \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "title": "<string>",
  "description": "<string>",
  "coverImageResource": {
    "type": "New",
    "id": 123
  },
  "thumbnailResource": {
    "type": "New",
    "id": 123
  },
  "postsIds": [
    123
  ]
}
'

{
  "parameters": "{ \"post_id\": [ \"is missing\" ] }",
  "body": "{ \"discount\": { \"percentOff\": [ \"is missing\" ] } }"
}