curl --request POST \
  --url https://api.example.com/v1/crm/agents/ \
  --header 'Content-Type: application/json' \
  --data '
{
  "name": "<string>",
  "phone": "<string>",
  "extra": "<unknown>"
}
'

{
  "id": 123,
  "name": "<string>",
  "phone": "<string>",
  "extra": "<unknown>"
}