ios - Open WhatsApp conversation using Abid doesn't work -

i'm trying open whatsapp conversation/chat particular contact. instead of opening desired chat opens app. no idea whats wrong :

 let urlstring  = "whatsapp://send?abid=\(id);text=lol;"         uiapplication.sharedapplication().openurl(nsurl(string: urlstring)!) 

urlstring value : whatsapp://send?abid=414;text=lol

any suggestions?

update url this:

whatsapp://send?abid=\(id)&text=lol 

source here.