curl --request POST \
  --url https://api.getmaito.com/v1/newsletter/subscribers/{subscriberId}/block \
  --header 'Authorization: Bearer <token>'

{
  "data": {
    "id": "<string>",
    "workspaceId": "<string>",
    "accountSetId": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "emailNormalized": "jsmith@example.com",
    "emailOriginal": "<string>",
    "subscribedAt": "<string>",
    "createdAt": "<string>",
    "updatedAt": "<string>",
    "source": "<string>",
    "sourceIssueId": "<string>",
    "sourcePostId": "<string>",
    "sourceCtaLinkId": "<string>",
    "sourceVisitorId": "<string>",
    "unsubscribedAt": "<string>"
  }
}