List affiliate customers

curl --request GET \
  --url https://api.shoppex.io/dev/v1/affiliates/customers \
  --header 'Authorization: Bearer <token>'

{
  "data": {
    "customers": [
      {
        "id": "cus_1",
        "affiliate_link_id": "alink_1",
        "customer_id": "cus_1",
        "email": "[email protected]",
        "name": "Creator",
        "code": "creator",
        "url": "https://demo.shoppex.io?via=creator",
        "total_sales": 4,
        "total_revenue": 180,
        "total_commission": 36,
        "available_balance": 12,
        "status": "approved",
        "is_active": true,
        "is_approved": true,
        "joined_at": "2026-03-15T10:00:00.000Z",
        "updated_at": "2026-03-15T11:00:00.000Z"
      }
    ],
    "total": 1
  }
}