目前 Shopify 方案是 Basic Plan 的商家們，即明年 2023/01/01 開始，申請 Carrier Service 的方式調整了，修改申請方式如下：

Shopify Advanced / Plus plans 可依然擁有 Carrier Service 服務。
Shopify plan 可以申請 Carrier Service，且不需轉為年繳就可申請。
Shopify Basic plan 無法申請 Carrier Service 。

原文內容：

Requirements for accessing the CarrierService resource

To access the CarrierService resource, add the write_shipping permission to your app's requested scopes. For more information, see API access scopes.

Your app's request to create a carrier service will fail unless the store installing your carrier service meets one of the following requirements:

It's on the Advanced Shopify plan or higher.
It's on the Shopify plan with yearly billing, or the carrier service feature has been added to the store for a monthly fee. For more information, contact Shopify Support.
It's a development store.

Note

If a store changes its Shopify plan, then the store's association with a carrier service is deactivated if the store no long meets one of the requirements above.

資料來源：https://shopify.dev/api/admin-rest/2022-10/resources/carrierservice

[2022/12/21]-Carrier Service 將於 2023/01/01 起適用於 Shopify 以上方案