How to correctly set the action?

Question

JavaScript

if i don't do it like this

$.ajax({
                url: myajax.url,
                type: 'POST', 
                cache: false,
                contentType: false,
                processData: false,
                data: data, 
                data: {
                    action: 'request',
                    phone: phone, 
                    email: email,
                    surname: surname,
                    name: name,
                    days: days,
                    money: money,
                },
              
             }).done(function(data){

 

            });
         }

but like this

if( typeof files == 'undefined' ) return;

      var data = new FormData();

      $.each( files, function( key, value ){
        data.append( key, value );
      });
    $.ajax({
                url: myajax.url,
                type: 'POST', 
                cache: false,
                contentType: false,
                processData: false,
                data: data, 
              
             }).done(function(data){

            });
         }

Answer 1

data.append('action', 'request');