Bilibili Posts by user API

Please help me write a data collection script with the EveryInfra Bilibili Posts by user endpoint (bilibili/user_posts).

Endpoint contract:
- 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 bilibili and action to user_posts, and put the parameters inside params.
- Required parameters:
  - user_id: Specifies a Bilibili uploader's numeric mid, extracted from https://space.bilibili.com/<mid>. Provide only the raw integer in user_id, without nicknames, BV IDs, or full space URLs.
- Optional parameters:
  - limit: The most rows to return in this call, an integer from 1 to 50. The default applies when you leave it out, and a call can return fewer rows. Larger values return 422 before any charge. (default: 20)
- Returns a list of records. Main fields of each record: id, url, title, text, duration_seconds, duration_sec, duration_text (Duration as displayed text (for example…), view_count, like_count, comment_count, danmaku_count (Danmaku (on-screen comment) count), favorite_count (Favorites); 21 fields in total, full list at https://api.everyinfra.com/api/v1/social/catalog?platform=bilibili.
- Example request body:
{
  "platform": "bilibili",
  "action": "user_posts",
  "params": {
    "user_id": "946974"
  }
}
- Price: $0.56 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.