Services come with their own configuration files.
For the configuration of service -> implementation mappings, ServiceMatrix is used.
The default mapping file is "service-matrix.properties", and looks like this:
e.g., to change the keystore service, simply replace the line
id.walt.services.keystore.KeyStoreService=id.walt.services.keystore.SqlKeyStoreService
with your own implementation mapping, e.g. for the Azure HSM keystore:
id.walt.services.keystore.KeyStoreService=id.walt.services.keystore.azurehsm.AzureHSMKeystoreService
To add a service configuration:
id.walt.services.keystore.KeyStoreService=id.walt.services.keystore.SqlKeyStoreService:sql.conf
Service configuration is by default in HOCON format. Refer to the specific service on how their configuration is laid out.