| array |
array of data and success/error counts
| int | success | the number of subscribers successfully found on the list
| | int | errors | the number of subscribers who were not found on the list
| | array | data | an array of arrays where each activity record has:
| string | action | The action name, one of: open, click, bounce, unsub, abuse, sent
| | string | timestamp | The date/time of the action
| | string | url | For click actions, the url clicked, otherwise this is empty
| | string | bounce_type | For bounce actions, the bounce type, otherwise this is empty
| | string | campaign_id | The campaign id the action was related to, if it exists - otherwise empty (ie, direct unsub from list)
| | |