X (Twitter) Media posts API

Please help me write a data collection script with the EveryInfra X (Twitter) Media posts endpoint (twitter/user_media).

How the endpoint works:
- 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 twitter and action to user_media, and put the parameters inside params.
- Required parameters:
  - username: The account whose photo and video posts you want, such as NASA; a leading @ is removed.
- Optional parameters:
  - page_token: Page token for user_media, user_replies, retweeters, search_communities, community_posts and search_users. Leave it out for the first page, then pass back the previous response's next_page_token exactly as received.
- Returns a list of records. Main fields of each record: next_page_token, id, url, text, like_count, retweet_count, reply_count, view_count, posted_at, author_username, author_name, author_url; 30 fields in total, full list at https://api.everyinfra.com/api/v1/social/catalog?platform=twitter.
- Example request body:
{
  "platform": "twitter",
  "action": "user_media",
  "params": {
    "username": "nasa"
  }
}
- Price: $0.81 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.