curl --location --request GET '//api.postmarkapp.com//messages/outbound/opens/?count=&offset=' \
--header 'X-Postmark-Server-Token;'
{
"Opens": [
{
"Client": {
"Company": "string",
"Family": "string",
"Name": "string"
},
"FirstOpen": true,
"Geo": {
"City": "string",
"Coords": "string",
"Country": "string",
"CountryISOCode": "string",
"IP": "string",
"Region": "string",
"RegionISOCode": "string",
"Zip": "string"
},
"MessageID": "string",
"OS": {
"Company": "string",
"Family": "string",
"Name": "string"
},
"Platform": "string",
"ReceivedAt": "2019-08-24T14:15:22Z",
"Recipient": "user@example.com",
"Tag": "string",
"UserAgent": "string"
}
],
"TotalCount": 0
}