Bulk enrich people

Enriches up to 25,000 people in one call. Each item is what /v2/enrich/persons (email, or name with a company) or /v2/fetch/persons (LinkedIn URL) takes, priced like it. The credits of every item are reserved at once, up to the balance (items past it read insufficient_credits and cost nothing), and given back for what is not found. Duplicates of an earlier item are enriched once and cost nothing. Answers 202 at once with the task: follow it at links.self (wait=N holds the request until it settles), or pass webhookUrl to receive one POST when it settles; once it is completed or cancelled, links.results gives the results CSV, one row per item in the order sent. families adds the contact finders (contact_email, contact_phone) and needs their permission; emailType chooses the kind of email. A field the body or an item does not define is refused with 422 UNKNOWN_FIELD (the field, the one it most likely stands for, the accepted fields), never ignored: the task would otherwise run without it. An API key with credit limits must hold the whole reservation: a task that would take it over its daily, monthly or total limit is refused with KEY_CREDIT_LIMIT_REACHED before anything is reserved, and a started task counts against the key what it reserved, then only what it spent once it settles. Following a task, cancelling it and downloading its results stay open at a zero balance. Credits: the unit price of each item, as /v2/enrich/persons, /v2/fetch/persons and /v2/contact/*. The request itself is free.