When a lead vendor only provides a TrustedForm Certificate URL, you can
generate a new Ping URL for the Certificate. Simply append /ping_url to
the Certificate URL and perform an unauthenticated GET.
Each call to this endpoint will generate a new Ping URL, they are all equally valid.
A successful call to this endpoint does not guarantee that the Certificate URL you have provided is valid and unexpired. The standard Certificate expiration window still applies.