2026-02-09

The POST /v1/comments endpoint now accepts an optional subscriber_id parameter. When provided, the comment is attributed to that subscriber instead of the newsletter author.

curl -X POST "https://api.buttondown.com/v1/comments" \
  -H "Authorization: Token YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "email_id": "your-email-id",
    "subscriber_id": "your-subscriber-id",
    "text": "Great article, thanks for writing this!"
  }'

The subscriber must belong to your newsletter and have access to comment on the email. If subscriber_id is omitted, the comment is attributed to the author as before.