I tried to search conversation from Intercom API using Postman but it always return server error message. I just followed their API docs.
request url: POST https://api.intercom.io/conversations/search?query=updated_at>1590278400
The query should be in JSON format in the Body, not in the querystring like you do in your example:
{
"query": {
"field": "updated_at",
"operator": ">",
"value": 1590278400
}
}
In Postman it looks like this (note: don't forget to add your authentication)