The CertificateExchangeService (short: "cex") is primarily used internally. See section Certificate exchange.

XML configuration

<?xml version="1.0"  encoding="ISO-8859-1"?>
<!DOCTYPE Configure PUBLIC
 "-//EBD Integration//DTD Configure 1.0//EN"
 "http://www.lobster.de/dtd/configure_1_1.dtd">
<Configure class="com.ebd.hub.services.certexchange.CertificateExchangeService">
 
    <!-- Name of the DB alias to be used for internal data -->
    <Set name="dBAlias">hub</Set>
    
    <!-- Sender address to be used for outgoing CEX mails -->
    <Set name="mailSenderAddress">sender@example.com</Set>
 
</Configure>

Let's Encrypt

See section Let's Encrypt/ACME/Certbot (receiving and renewing certificates from Certificate Authority free of charge and automatically).