(1) Subject to assessment of fees under RCW 26.26A.400 through 26.26A.515, payment of the cost of initial genetic testing must be made in advance:

(a) By a child support agency in a proceeding in which the child support agency is providing services;

(b) By the individual who made the request for genetic testing;

(c) As agreed by the parties; or

(d) As ordered by the court.

(2) If the cost of genetic testing is paid by a child support agency, the agency may seek reimbursement from the genetic parent whose parent-child relationship is established.