eBay Search API

Please help me write a data collection script with the EveryInfra eBay Search endpoint (ebay/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 ebay and action to search, 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:
  - condition: Filters search results by item condition. Preserve capitalization and spaces: New, Used, Refurbished, or For parts or not working. This is an item-condition filter, not a positive or negative review filter.
  - 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.
  - max_price: Sets a numeric upper bound for item prices in search. Use it with min_price to define a range, and do not assume that shipping or taxes are included.
  - 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.
  - sold_only: Boolean toggle in search actions to return only completed sales when set to true. Must be passed as a JSON boolean, not a string ("false").
  - 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: item_id, title, url, price, price_text, currency, condition, shipping, seller, image_url, scraped_at.
- Example request body:
{
  "platform": "ebay",
  "action": "search",
  "params": {
    "keyword": "mechanical keyboard"
  }
}
- 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.