curl --request GET \
  --url https://api.eflow.team/v1/networks/couponcodes \
  --header 'X-Eflow-Api-Key: <api-key>'

{
  "couponcodes": [
    {
      "network_coupon_code_id": 123,
      "network_id": 123,
      "network_affiliate_id": 123,
      "network_offer_id": 123,
      "coupon_code": "<string>",
      "coupon_status": "active",
      "internal_notes": "<string>",
      "description": "<string>",
      "is_description_plain_text": true,
      "start_date": "<string>",
      "end_date": "<string>",
      "time_created": 123,
      "time_saved": 123
    }
  ],
  "paging": {
    "page": 123,
    "page_size": 123,
    "total_count": 123
  }
}