; (ii) deny any licensed provider of adoption or foster care placement or related services reasonable payment for services actually rendered in reliance on a certificate; (iii) require a provider of adoption or foster care placement or related services to perform such services in a particular instance as a condition of participating in the certificate program prescribed by subsection (c)(1), unless such service is required by Federal law or imposed pursuant to an agreement between the provider and the State that compensates the provider for such service exclusively with State revenues