Today Shopify announced that starting January 1, 2023, stores on the Shopify Starter and Basic plans will no longer be able to request access to the Carrier Service API. It means that it's not all Shopify plans will have access to Shipping apps that offer shipping rates.
Stores on the Shopify Advanced and Plus plans will continue to have access to the Carrier Service API. Stores on the Shopify plan can continue to request access by contacting Shopify support. Stores on the Shopify Starter or Basic plans that were previously granted access are not impacted by this change and will keep their access to the Carrier Service API.
Update your Shopify App Store listing and any other external communications to reflect this change by January 1, 2023.
Inform your support staff about the changing access requirements and timelines.