Function Syntax : 
${macroFunction(macro)}
 
ShorthandProperty lookup notationsyntax:
${macro}
 
Example Usage: 
${secure(accessKey)} - get access key from secure store 
${logicalStartTime(timeFormat)} - apply time function on the timeFormat provided and use the value. 
 
The Default (shortHand) usage will substitute arguments using the following precedence:
Custom Action Workflow-Token > Runtime Arguments > Stored Preferences
 
Examples:
ipConfig: ${hostname}:${port}
JDBC connection string : jdbc:${jdbc-plugin}://${hostname}:${sql-port}/${db-name}
 
Using the expanded syntax allows additional logic to be applied to the macro arguments through a macro function.
Escaping can be supported using the \ (backslash) character (e.g. \${hostname} will not be substituted)
 
Nested macros:
if a macro contains another macro, Example : ${secure(${user-name})} 
In the above example, we want to lookup the user-name in properties first, then use secure store to get the key/password for that user-name. this final key/password will be used for that field.