curl --request POST \
  --url https://api.opper.ai/v3/spans \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "name": "<string>"
}
'

{
  "data": {
    "id": "<string>",
    "name": "<string>",
    "trace_id": "<string>",
    "parent_id": "<string>",
    "type": "<string>"
  }
}