Hello,
I will try to make it clear for what I am asking for, lets suppose I executed the AddCampaigns.php but I removed the Optional line code, the start date of the campaign will be filled automatically by the AdWords account of the user, so there are some default values that the AdWords fill in if the user did not specify it right? if so, then I suppose I can set the default values from my code? and the reason of my concern is to know if I should put all the optional settings in an "If{}else{}" statements to know when to execute them or I can simply execute them at all cases but the values of them would be only the default values that the AdWords would put like the example of the start date I mentioned before.
I hope I made myself clear this time, I am ready for any question If there is anything not clear.