A more thorough explanation:

Term: Viator
Definition: A viator is someone who is either an apparitor or a terminally/chronically ill life-insurance policyholder who sells their policy to a third party for a lump-sum payment that is a percentage of the policy's face value.
Examples:

• John works as a viator for the court, serving legal documents to people.
• Mary is a viator who has been diagnosed with a terminal illness. She decides to sell her life-insurance policy to a third party for a lump-sum payment.

The first example illustrates the definition of viator as an apparitor. An apparitor is someone who serves legal documents to people, and John is described as a viator who does this for the court. The second example illustrates the definition of viator as a terminally/chronically ill life-insurance policyholder who sells their policy to a third party for a lump-sum payment. Mary is described as a viator who has been diagnosed with a terminal illness and decides to sell her life-insurance policy for a lump-sum payment.