adwords api reporting Missing client information

[jane]

I'm sorry if someone has posted similar problem already, I just can't 
figure it out.
I'm trying to get daily costs of my campaigns. 
I use this documentation 
https://developers.google.com/adwords/api/docs/guides/reporting

I am also using php and Yii2. I've got:

client Customer Id

client id     
 access token    
 client_secret 

refresh_token   

When I get Campaigns names and ids, those client Customer Id,client 
id,client_secret are enough and I get campaigns without any problem but 
when I try to get a report, there is the error 

    string(581) "HTTP/1.1 400 Bad Request
    Content-Type: text/xml
    Date: Mon, 22 May 2017 10:31:52 GMT
    Expires: Mon, 22 May 2017 10:31:52 GMT
    Cache-Control: private, max-age=0
    X-Content-Type-Options: nosniff
    X-Frame-Options: SAMEORIGIN
    X-XSS-Protection: 1; mode=block
    Server: GSE
    Accept-Ranges: none
    Vary: Accept-Encoding
    Transfer-Encoding: chunked
    
    <?xml version="1.0" encoding="UTF-8" 
standalone="yes"?><reportDownloadError><ApiError><type>ReportDownloadError.INVALID_PARAMETER</type><trigger>Missing
 
client 
information</trigger><fieldPath></fieldPath></ApiError></reportDownloadError>"

Maybe I make post request with curl wrong, since I'm able to get campaigns 
without mistakes.
Here is my code

    $ch = curl_init();
    
            curl_setopt($ch, 
CURLOPT_URL,"http://adwords.google.com/api/adwords/reportdownload/v201702";);
            curl_setopt($ch, CURLOPT_POST, 1);
            curl_setopt($ch,CURLOPT_HEADER,1);
    
    $XML= <<<XML
    <?xml version="1.0" encoding="UTF-8"?>
    <reportDefinition 
xmlns="https://adwords.google.com/api/adwords/cm/v201702";>
        <selector>
            <fields>CampaignId</fields>
            <fields>AdGroupId</fields>
            <fields>Impressions</fields>
            <fields>Clicks</fields>
            <fields>Cost</fields>
            <predicates>
                <field>AdGroupStatus</field>
                <operator>IN</operator>
                <values>ENABLED</values>
                <values>PAUSED</values>
            </predicates>
        </selector>
        <reportName>Custom Adgroup Performance Report</reportName>
        <reportType>ADGROUP_PERFORMANCE_REPORT</reportType>
        <dateRangeType>TODAY</dateRangeType>
        <downloadFormat>CSV</downloadFormat>
    </reportDefinition>
    XML;
    
    $headers = array("Content-Type:multipart/form-data",
     "Authorization"=> "Bearer my_access_token",
      "developerToken" => "my_developer_token",
     "clientCustomerId"=> 111-111-1111, // test account
    
    ); 
    
    $postfields = array("__rdxml" =>$XML );
            curl_setopt($ch, CURLOPT_HTTPHEADER , $headers);
            curl_setopt($ch, CURLOPT_POSTFIELDS, $postfields);
    
    
     curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    
            $server_output = curl_exec ($ch);
     echo "<pre>";
    var_dump($server_output);
    echo "</pre>";
            curl_close ($ch);

I also tried 

$campaignService = $ADwordsUser->GetService('CampaignService', ADWORDS_VERSION);

// Create selector.
$selector = new Selector();
// Fields to retrieve
$selector->fields = array('Id', 'Name', 'Cost');
// Date rage for stats
$selector->dateRange->min = "20110613";
$selector->dateRange->max = "20110614";

// Get all campaigns.
$page = $campaignService->get($selector);

if(isset($page->entries)){
    foreach ($page->entries as $campaign) {
        if(isset($campaign->campaignStats)) {
            // This is how you get the cost
            $cost = $campaign->campaignStats->cost->microAmount/1000000;
            print "Cost for Campaign {$campaign->name} = $cost\n";
        }
    }
}



but it returns
Creating default object from empty valuewhen it goes here

$selector->dateRange->min = "20110613";

, I guess because $selector is null...

But if I remove 


$selector->dateRange->min = "20110613";
$selector->dateRange->max = "20110614";

I get 

[SelectorError.INVALID_FIELD_NAME @ serviceSelector; trigger:'Cost']


And I'm also not sure if 

$campaign->campaignStats

exists...

Thank you to anyone who can help.

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