Requests a tax package for a company. Generation is asynchronous: the response is the tax package object with status: "generating".

contents takes lists of IDs to include:

• employee_tax_statements — employee tax statement IDs (ets_...).
• contractor_tax_statements — contractor tax statement IDs (cts_...). This list applies only when contractor tax statements are enabled for your account; otherwise it is ignored.
• filings — company filing IDs.

Each list is optional, but the package must contain at least one ID, and every ID must belong to company. See the Tax Packages guide for details.