curl --request POST \
  --url https://api.eflow.team/v1/networks/affiliatetiers \
  --header 'Content-Type: application/json' \
  --header 'X-Eflow-Api-Key: <api-key>' \
  --data '
{
  "name": "Gold Partners",
  "status": "active",
  "description": "Top-performing affiliates",
  "payout_margin": 10,
  "is_default_tier": false,
  "network_affiliate_ids": []
}
'

{
  "network_affiliate_tier_id": 123,
  "network_id": 123,
  "name": "<string>",
  "status": "active",
  "description": "<string>",
  "network_affiliate_ids": [
    123
  ],
  "payout_margin": 123,
  "is_default_tier": true
}