How to receive a CA signed certificate and import issuer certificates into a key database using GSKKYMAN which is a component of z/OS to use with Sterling Connect:Direct for z/OS.
This presentation is also available in PDF: ftp://ftp.software.ibm.com/software/iea/content/com.ibm.iea.scd4z/scd4z/5.1/content/scd4z_GSKKYMAN_Part_4_Receiving_a_CA_Signed_Certificate.pdf