[From string (line 22) ]                                                                             
                                                                                                     
@startuml                                                                                            
!unquoted function $app($id)                                                                         
!includeurl https://raw.githubusercontent.com/RicardoNiepel/C4-PlantUML/release/1-0/C4_Container.puml
!$data={"participants" :[                                                                            
{"id": "cm" ,"label": "customer master","desc": "manages customers"},                                
{"id": "tm" ,"label": "transaction manager","desc": "manages transactions"},                         
{"id": "am" ,"label": "account master","desc": "manages accounts"}                                   
]                                                                                                    
}                                                                                                    
!foreach $part in $data.participants                                                                 
  !if $part.id == $id                                                                                
    !ifdef $INCLUDE_DESC                                                                             
      !return "System(" + $part.id + ", '" + $part.label + "' , '" + $part.desc + "')"               
    !else                                                                                            
      !return "System(" + $part.id + ", '" + $part.label + "')"                                      
    !endif                                                                                           
  !endif                                                                                             
!endfor                                                                                              
!return "System(" + $id + ", 'enter label')"                                                         
!endfunction                                                                                         
                                                                                                     
!includeurl https://raw.githubusercontent.com/RicardoNiepel/C4-PlantUML/release/1-0/C4_Container.puml
^^^^^                                                                                                
 Cannot open URL