after_processed.rb

// https://dev.twitter.com/ads/analytics/metrics-derived
// the impressions calculation (website_click) :
// promoted_tweet_timeline_impressions"=>[1913],
// promoted_tweet_search_impressions"=>[0],
// promoted_tweet_profile_impressions"=>[419],
// impressions = 2332

[{"total_audience_reach"=>nil, "average_frequency"=>nil, "impressions"=>0, "engagements"=>0, "cpm"=>NaN, "link_clicks"=>0, "cp_link_click"=>NaN, "ctr"=>NaN, "cpe"=>NaN, "app_clicks"=>0, "app_ctr"=>NaN, "cp_app_click"=>NaN, "installs"=>0, "cp_install"=>NaN, "video_starts"=>nil, "video_plays_25"=>0, "video_plays_50"=>0, "video_plays_75"=>0, "video_plays_100"=>0, "video_plays"=>0, "video_replays"=>0, "video_play_rate"=>NaN, "cp_video_play"=>NaN, "video_ctp"=>0, "followers"=>0, "follow_rate"=>0.0, "cp_follows"=>NaN, "media_views"=>0, "media_view_rate"=>NaN, "leads"=>0, "lead_rate"=>NaN, "cp_lead"=>NaN, "qualified_impressions"=>0, "qcpm"=>NaN, "spend"=>0.0, "billed_engagements"=>0, "engagement_rate"=>NaN, "clicks"=>0, "retweets"=>0, "replies"=>0, "follows"=>0, "card_engagements"=>0, "site_visits"=>0, "cp_site_visit"=>NaN, "purchases"=>0, "cp_purchase"=>NaN, "downloads"=>0, "cp_download"=>NaN, "sign_ups"=>0, "cp_sign_up"=>NaN, "custom"=>0, "cp_custom"=>NaN, "total_conversions"=>0, "cp_conversion"=>NaN, "conversion_rate"=>NaN, "start_time"=>Tue, 22 Mar 2016 00:00:00 JST +09:00, "end_time"=>Sun, 27 Mar 2016 23:59:59 JST +09:00, "id"=>"4q98q", "objective"=>"WEBSITE_CLICKS"}, {"total_audience_reach"=>nil, "average_frequency"=>nil, "impressions"=>nil, "engagements"=>nil, "cpm"=>nil, "link_clicks"=>nil, "cp_link_click"=>nil, "ctr"=>nil, "cpe"=>nil, "app_clicks"=>nil, "app_ctr"=>nil, "cp_app_click"=>nil, "installs"=>nil, "cp_install"=>nil, "video_starts"=>nil, "video_plays_25"=>nil, "video_plays_50"=>nil, "video_plays_75"=>nil, "video_plays_100"=>nil, "video_plays"=>nil, "video_replays"=>nil, "video_play_rate"=>nil, "cp_video_play"=>nil, "video_ctp"=>nil, "followers"=>nil, "follow_rate"=>nil, "cp_follows"=>nil, "media_views"=>nil, "media_view_rate"=>nil, "leads"=>nil, "lead_rate"=>nil, "cp_lead"=>nil, "qualified_impressions"=>nil, "qcpm"=>nil, "spend"=>nil, "billed_engagements"=>nil, "engagement_rate"=>nil, "clicks"=>nil, "retweets"=>nil, "replies"=>nil, "follows"=>nil, "card_engagements"=>nil, "site_visits"=>nil, "cp_site_visit"=>nil, "purchases"=>nil, "cp_purchase"=>nil, "downloads"=>nil, "cp_download"=>nil, "sign_ups"=>nil, "cp_sign_up"=>nil, "custom"=>nil, "cp_custom"=>nil, "total_conversions"=>nil, "cp_conversion"=>nil, "conversion_rate"=>nil, "start_time"=>nil, "end_time"=>nil, "id"=>nil, "objective"=>nil}]

from_api.rb

{"data_type"=>"stats",
 "data"=>
  {"promoted_tweet_profile_retweets"=>[0],
   "start_time"=>"2016-03-23T15:00:00Z",
   "promoted_tweet_timeline_card_engagements"=>[0],
   "promoted_account_follow_rate"=>[0.0],
   "promoted_video_views_100"=>[0],
   "promoted_tweet_search_url_clicks"=>[0],
   "promoted_tweet_search_clicks"=>[0],
   "promoted_video_views_75"=>[0],
   "promoted_tweet_search_favorites"=>[0],
   "billed_charge_local_micro"=>[1219000000],
   "promoted_tweet_search_retweets"=>[0],
   "promoted_tweet_timeline_media_views"=>[0],
   "promoted_tweet_tpn_qualified_impressions"=>[0],
   "promoted_tweet_profile_follows"=>[0],
   "promoted_tweet_timeline_favorites"=>[0],
   "promoted_video_total_views"=>[0],
   "promoted_tweet_app_open_attempts"=>[0],
   "promoted_tweet_profile_impressions"=>[419],
   "promoted_tweet_search_card_engagements"=>[0],
   "promoted_tweet_profile_favorites"=>[0],
   "promoted_account_impressions"=>[0],
   "end_time"=>"2016-03-30T15:00:00Z",
   "promoted_tweet_search_replies"=>[0],
   "promoted_tweet_search_follows"=>[0],
   "promoted_video_views_50"=>[0],
   "promoted_tweet_profile_media_views"=>[0],
   "promoted_account_profile_visits"=>[0],
   "promoted_tweet_search_qualified_impressions"=>[0],
   "promoted_video_views_25"=>[0],
   "promoted_tweet_timeline_clicks"=>[28],
   "id"=>"4q98q",
   "promoted_tweet_timeline_impressions"=>[1913],
   "promoted_account_follows"=>[0],
   "promoted_tweet_timeline_url_clicks"=>[11],
   "conversion_site_visits"=>[9],
   "promoted_tweet_timeline_qualified_impressions"=>[0],
   "billed_follows"=>[0],
   "promoted_tweet_search_media_views"=>[0],
   "granularity"=>"TOTAL",
   "promoted_video_replays"=>[0],
   "promoted_tweet_timeline_retweets"=>[1],
   "promoted_tweet_profile_url_clicks"=>[0],
   "promoted_tweet_timeline_replies"=>[0],
   "promoted_tweet_app_install_attempts"=>[0],
   "conversion_sale_amount"=>[0],
   "promoted_tweet_profile_replies"=>[0],
   "promoted_video_cta_clicks"=>[0],
   "billed_engagements"=>[9],
   "conversion_order_quantity"=>[0],
   "promoted_tweet_profile_card_engagements"=>[0],
   "promoted_tweet_timeline_follows"=>[0],
   "promoted_tweet_profile_clicks"=>[2],
   "promoted_tweet_search_engagements"=>[0],
   "promoted_tweet_timeline_engagements"=>[29],
   "promoted_tweet_search_impressions"=>[0],
   "promoted_tweet_profile_qualified_impressions"=>[0],
   "promoted_tweet_profile_engagements"=>[2]},
 "request"=>
  {"params"=>
    {"line_item_id"=>"4q98q",
     "start_time"=>"2016-03-23T15:00:00Z",
     "end_time"=>"2016-03-30T15:00:00Z",
     "account_id"=>"18ce54aq5jb",
     "granularity"=>"TOTAL",
     "metrics"=>
      ["conversion_purchases",
       "billed_charge_local_micro",
       "conversion_sign_ups",
       "promoted_tweet_app_open_attempts",
       "promoted_account_impressions",
       "promoted_account_profile_visits",
       "promoted_account_follows",
       "promoted_account_follow_rate",
       "conversion_site_visits",
       "billed_follows",
       "conversion_custom",
       "mobile_conversion_sign_ups",
       "promoted_tweet_app_install_attempts",
       "conversion_sale_amount",
       "mobile_conversion_purchases",
       "billed_engagements",
       "conversion_order_quantity",
       "conversion_downloads",
       "promoted_video_cta_clicks",
       "promoted_video_replays",
       "promoted_video_total_views",
       "promoted_video_views_25",
       "promoted_video_views_50",
       "promoted_video_views_75",
       "promoted_video_views_100",
       "mobile_conversion_installs",
       "promoted_tweet_timeline_engagements",
       "promoted_tweet_timeline_impressions",
       "promoted_tweet_timeline_url_clicks",
       "promoted_tweet_timeline_clicks",
       "promoted_tweet_timeline_favorites",
       "promoted_tweet_timeline_retweets",
       "promoted_tweet_timeline_replies",
       "promoted_tweet_timeline_follows",
       "promoted_tweet_timeline_card_engagements",
       "promoted_tweet_timeline_media_views",
       "promoted_tweet_search_engagements",
       "promoted_tweet_search_impressions",
       "promoted_tweet_search_url_clicks",
       "promoted_tweet_search_clicks",
       "promoted_tweet_search_favorites",
       "promoted_tweet_search_retweets",
       "promoted_tweet_search_replies",
       "promoted_tweet_search_follows",
       "promoted_tweet_search_card_engagements",
       "promoted_tweet_search_media_views",
       "promoted_tweet_profile_engagements",
       "promoted_tweet_profile_impressions",
       "promoted_tweet_profile_url_clicks",
       "promoted_tweet_profile_clicks",
       "promoted_tweet_profile_favorites",
       "promoted_tweet_profile_retweets",
       "promoted_tweet_profile_replies",
       "promoted_tweet_profile_follows",
       "promoted_tweet_profile_card_engagements",
       "promoted_tweet_profile_media_views",
       "promoted_tweet_timeline_qualified_impressions",
       "promoted_tweet_search_qualified_impressions",
       "promoted_tweet_profile_qualified_impressions",
       "promoted_tweet_tpn_qualified_impressions"]}}}