eBay Reviews API

Please help me write a data collection script with the EveryInfra eBay Reviews endpoint (ebay/reviews).

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 ebay and action to reviews, and put the parameters inside params.
- Required parameters:
  - seller: The exact eBay seller account username, not a store display title or company name. Used in store queries to fetch seller item listings, and in reviews queries paired with item_id to retrieve buyer feedback.
  - item_id: The numeric eBay item identifier associated with a seller listing (typically extracted from /itm/ URLs), used paired with seller in reviews queries.
- Optional parameters:
  - country: A compatibility input for domain that also takes an eBay site domain such as ebay.com, not a country code such as US or DE. When both are present, domain takes precedence.
  - domain: Selects the eBay site domain, such as ebay.com, ebay.de, or ebay.co.uk, without a scheme or path. It defaults to ebay.com and is used to build pages for search, store, and reviews.
  - product_id: Compatibility alias for item_id accepting the numeric eBay item identifier. reviews actions must still meet the required contract containing item_id.
  - q: Compatibility alias for item_id accepting the numeric eBay item identifier in reviews actions. Does not serve as a free-text search query; use keyword for product searches.
  - seller_name: The eBay seller account username.
  - url: Overrides automatic URL construction with a direct eBay store/seller listing page in store actions, or a /fdbk/ feedback page in reviews actions.
  - username: Compatibility alias for the seller account username in store and reviews actions. The seller parameter takes precedence and remains required; this field does not represent buyer or reviewer handles.
  - limit: The most rows to return in this call, an integer from 1 to 100. 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: text, rating, rating_scale, username, submitted_at, seller_reply, image_count, reviewer_feedback_score, reviewer_feedback_star, product_name, product_id, product_price; 14 fields in total, full list at https://api.everyinfra.com/api/v1/social/catalog?platform=ebay.
- Example request body:
{
  "platform": "ebay",
  "action": "reviews",
  "params": {
    "seller": "musicmagpie",
    "item_id": "388071794887"
  }
}
- Price: $1.39 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.