curl --request GET \
  --url https://api.withflex.com/v1/refunds \
  --header 'Authorization: Bearer <token>'

{
  "refunds": [
    {
      "refund_id": "<string>",
      "payment_intent_id": "<string>",
      "amount": 123,
      "created_at": "<string>",
      "reason": "duplicate",
      "status": "pending",
      "test_mode": true,
      "metadata": {},
      "reference_id": "<string>",
      "reference_type": "acquirer_reference_number",
      "reference_status": "available"
    }
  ]
}