getACMEFederationCertificateChain   
  abstract suspend fun getACMEFederationCertificateChain(discoveryUrl: String): NetworkResponse<List<String>>
Retrieves the ACME federation certificate chain from the specified discovery URL.
Return
A NetworkResponse object containing the certificate chain as a list of strings.
Parameters
discoveryUrl 
The non-blank URL of the ACME federation discovery endpoint.