Request:
POST /api/adwords/reportdownload/v201702 HTTP/1.1
User-Agent: Test App (AwApi-PHP, googleads-php-lib/25.0.0, PHP/5.5.9, GuzzleHttp/6.0.0, curl/7.52.0)
Content-Type: application/x-www-form-urlencoded
Host: adwords.google.com
Authorization: REDACTED
developerToken: REDACTED
clientCustomerId: 111-222-3333
skipReportHeader: false
skipColumnHeader: false
skipReportSummary: false
useRawEnumValues: true
includeZeroImpressions: false

__rdquery=SELECT CampaignId, AdGroupId, Id, Criteria, CriteriaType, Impressions, Clicks, Cost FROM CRITERIA_PERFORMANCE_REPORT WHERE Status IN [ENABLED, PAUSED] DURING LAST_7_DAYS&__fmt=CSV

Response:
HTTP/1.1 200 OK

"CRITERIA_PERFORMANCE_REPORT (Apr 4, 2017-Apr 10, 2017)"
Campaign ID,Ad group ID,Keyword ID,Keyword / Placement,Criteria Type,Impressions,Clicks,Cost
11111,33333,3000000,Content,KEYWORD,1,2,200000
2222,44444,300,Parent,PARENT,1,2,700000
5555,66666,3000000,Content,KEYWORD,1,2,100000
Total, --, --, --, --,3,6,1000000

--------
Error:
NULL