Missouri Revised Statutes Title XXX. Domestic Relations § 454.413. Filing with the state case registry, when

1. Each party to a paternity or child support proceeding establishing, modifying or enforcing a support order pursuant to chapter 210, chapter 211, chapter 452, or this chapter, shall file with the state case registry upon entry of an order, information on the location and identity of such party including the party's Social Security number, residential address, mailing address, telephone number, driver's license number and the name, address and telephone number of the party's employer. If such information changes, such party shall provide the new information to the state case registry within thirty days of any such change.

2. In any subsequent child support enforcement action between the parties, the court or division shall deem that the due process requirements for notice and service of process are met with respect to such party upon a sufficient showing that diligent effort has been made to ascertain the location of a party including written notice by certified mail to the last known address of the party and attempted service by publication, and written notice has been delivered to the most recent residential or employer address of such party filed with the state case registry.