# description
Message payload for catalog/subscription. At least one of `networkIds` or `schemaTypes` must be non-empty. An empty `schemaTypes` array is treated as the wildcard sentinel `"*"`, matching all schema types for the specified networks. 

# properties.subscription.properties.schemaTypes.description
Schema type URIs to filter on (empty = wildcard)

# properties.subscription.properties.callbackUrl.description
Override callback URL (defaults to context.bapUri)