This api can only be used without changing the tier structure, you can add options, delete options, and update the option image by this api — Shopee API

import requests

KEY = "q360_live_..."  # khóa API của brand
r = requests.post(
    "https://partner.quantri360.com/v1/shopee/api/v2/product/update_tier_variation",
    params={},
    json={
        "item_id": 100001,
        "standardise_tier_variation": [
            {
                "variation_id": 10001,
                "variation_option_list": [
                    {
                        "variation_option_id": 10002
                    }
                ]
            }
        ]
    },
    headers={"Authorization": f"Bearer {KEY}"},
    timeout=60,
)
print(r.status_code)
print(r.json())

const KEY = 'q360_live_...'; // khóa API của brand
const url = new URL('https://partner.quantri360.com/v1/shopee/api/v2/product/update_tier_variation');
for (const [k, v] of Object.entries({})) url.searchParams.set(k, typeof v === 'object' ? JSON.stringify(v) : String(v));
const r = await fetch(url, {
  method: 'POST',
  headers: { Authorization: `Bearer ${KEY}`, 'Content-Type': 'application/json' },
  body: JSON.stringify({"item_id":100001,"standardise_tier_variation":[{"variation_id":10001,"variation_option_list":[{"variation_option_id":10002}]}]}),
});
console.log(r.status, await r.json());

<?php
$key = 'q360_live_...'; // khóa API của brand
$url = 'https://partner.quantri360.com/v1/shopee/api/v2/product/update_tier_variation' . '?' . http_build_query([]);
$ch = curl_init($url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_HTTPHEADER, ['Authorization: Bearer ' . $key, 'Content-Type: application/json']);
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_POSTFIELDS, '{"item_id":100001,"standardise_tier_variation":[{"variation_id":10001,"variation_option_list":[{"variation_option_id":10002}]}]}');
$res = curl_exec($ch);
$status = curl_getinfo($ch, CURLINFO_HTTP_CODE);
curl_close($ch);
echo $status, "\n", $res;