Douyin Product search API

Please help me write a data collection script with the EveryInfra Douyin Product search endpoint (douyin/product_search).

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 douyin and action to product_search, and put the parameters inside params.
- Required parameters:
  - keyword: A Douyin product search phrase. Results form an independent product pool and do not establish that any specified creator promoted or sold those items.
- Optional parameters:
  - limit: The most rows to return in this call, an integer from 1 to 5. The default applies when you leave it out, and a call can return fewer rows. Larger values return 422 before any charge. (default: 5)
- Returns a list of records. Main fields of each record: product_id (Stable Douyin Mall product ID), promotion_id, title, url, image_url, white_image_url, price_cny (Displayed product price in yuan), price_cny_minor, price_label, monthly_sales, good_review_ratio, sales_trend; 26 fields in total, full list at https://api.everyinfra.com/api/v1/social/catalog?platform=douyin.
- Example request body:
{
  "platform": "douyin",
  "action": "product_search",
  "params": {
    "keyword": "美食"
  }
}
- 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.