nl_tokens: gets an ID from a single piece of payload .
pl_tokens: function getId ( payloadPiece , conf , path , fullPayload ) { if ( isWhat . isString ( payloadPiece ) ) return payloadPiece ; if ( isWhat . isPlainObject ( payloadPiece ) ) { if ( 'id' in payloadPiece ) return payloadPiece . id ; var <mask> = Object . keys ( payloadPiece ) ; if ( keys . length === 1 ) return keys [ 0 ] ; } return '' ; }