eBay Sold listings API

Please help me write a data collection script with the EveryInfra eBay Sold listings endpoint (ebay/sold).

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 sold, and put the parameters inside params.
- Required parameters:
  - keyword: Search term for active listings in search actions, or ended/sold listings in sold actions. Asking prices in active listings should not be assumed to match final transaction amounts.
- Optional parameters:
  - days: Integer representing the historical lookback window in days for sold queries (defaults to 30). Indicates time range rather than listing duration or returned item counts.
  - min_price: Sets a numeric lower bound for item prices. Filters active listing prices in search actions and ended/sold listing prices in sold actions.
  - site: Specifies the eBay domain for sold queries (for example, ebay.com or ebay.co.uk), defaulting to ebay.com. Distinct from the domain parameter used in search, store, or reviews actions.
  - sort: Sort order for sold actions; allowed values are newest (most recently ended first) and distance (proximity). Does not sort by original listing creation date. Defaults to recently ended order if omitted. (allowed: distance / newest)
  - limit: The most rows to return in this call, an integer from 1 to 200. 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, name, sold_price, shipping_price, total_price, currency, sold_at, condition, listing_type, best_offer_accepted, category; 16 fields in total, full list at https://api.everyinfra.com/api/v1/social/catalog?platform=ebay.
- Example request body:
{
  "platform": "ebay",
  "action": "sold",
  "params": {
    "keyword": "rtx 4080"
  }
}
- 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.