{
"page_size": 0,
"page_token": "string",
"filter": {
"certificate_ids": [
"string"
],
"certificate_types": [
"TYPE_UNSPECIFIED"
],
"user_ids": [
"string"
],
"created_since": "2019-08-24T14:15:22Z",
"created_until": "2019-08-24T14:15:22Z"
}
}