Xiaohongshu Comment replies API

Please help me write a data collection script with the EveryInfra Xiaohongshu Comment replies endpoint (xiaohongshu/sub_comments).

How the endpoint works:
- Request: POST https://api.everyinfra.com/api/v1/social with the header Authorization: Bearer <API key>. Read the key from the EVERYINFRA_API_KEY environment variable and never hard-code it.
- In the request body, set platform to xiaohongshu and action to sub_comments, and put the parameters inside params.
- Required parameters:
  - url: Specifies the full Xiaohongshu note URL, formatted as /explore/<note_id> or /discovery/item/<note_id>. Use recent search URLs that retain query parameters like xsec_token.
  - comment_id: Specifies the parent comment ID to retrieve sub-replies for in the sub_comments action. Obtain this ID from the comments response for the same note and pair it with the corresponding url. It is not a note ID or user ID.
- Optional parameters:
  - page_token: Pagination cursor for the comments, sub_comments, search, user_posts, search_users and hashtag actions: pass back the next_page_token value from a row of the previous response to fetch the next page.
- Returns a list of records. Main fields of each record: id, text (Note body or comment text), like_count (Like count), posted_at, ip_location (IP location (province or country) that…), author_name, author_id (The author's user ID), reply_to_id, reply_to_author_name, reply_to_author_id, next_page_token (Page token (search, comments, sub_comme…), images (Image links); 18 fields in total, full list at https://api.everyinfra.com/api/v1/social/catalog?platform=xiaohongshu.
- Example request body:
{
  "platform": "xiaohongshu",
  "action": "sub_comments",
  "params": {
    "url": "https://www.xiaohongshu.com/explore/6aa7a3f600000000110335f8?xsec_token=YByFNzoKupps8B3qI774Gx7XGxfHpq4QWEvxU4zsD8454%3D",
    "comment_id": "6aa80e9b000000000200c6ad"
  }
}
- Price: $5.56 per 1,000 requests; failed and empty results are not charged.
- For dozens or hundreds of targets, add "mode": "async" to the body: you get a job_id at once and poll GET https://api.everyinfra.com/api/v1/jobs/{job_id} for the result.
- On 422, fix the request using the suggested parameter names and allowed values in the error; on 429 or 503, wait for Retry-After and try again.

Before writing code, ask me which targets I need, how many, which fields, and what output format I want; then confirm the plan and the rough cost with me.