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POST /contacts/v1/contacts/actions/delete?type=listReference HTTP/1.1
Host: www.exacttargetapis.com
Content-Type: application/json
Authorization: Bearer ACCESS_TOKEN_GOES_HERE
Cache-Control: no-cache

{
 "deleteOperationType": "ContactAndAttributes",
 "targetList": {
   "listType": {
     "listTypeID": 3
   },
   "listKey": "Subscribers_to_Delete"
 },
 "deleteListWhenCompleted": false,
 "deleteListContentsWhenCompleted": true
}