Runs the identity half of toll-free verification: who the business is, the contact a verifier can reach, and the website that substantiates it. The messaging programme on the profile — use case, samples, opt-in evidence — is judged by POST /checks/tfn/campaign, because the two halves fail for different reasons and are worth fixing separately.

Checks are free and unlimited and never consume allowance. Pass the subject as a stored-resource reference OR as an inline payload — never both for the same subject. With options.wait: true the connection is held until the verdict is ready; otherwise a fast check arrives already passed/changes_required and a slow one arrives processing for polling. options.include_website_review triggers a real crawl and is subject to a per-account daily quota.