In Shopify any app that provides calculated shipping rates (including Calcurates app) is qualified as third-party carrier-calculated shipping. It doesn’t matter if there are rates provided by the carrier (FedEx, UPS, USPS, etc) or custom made rates that you can configure with Calcurates app. In both cases you still need this feature.
Video: How to enable a third-party shipping in Shopify?
Once you installed Calcurates app to your Shopify store and enter it you might see this warning message in the left menu:
Enable third-party carrier-calculated shipping on your Shopify store to display rates in your checkout
The Calcurates app can’t display shipping rates without this feature provided by Shopify.
To activate the third-party carrier-calculated shipping, your store needs to be on the Grow yearly, Advanced or Plus plan. If you're on the Grow monthly plan, then you can add this feature for a monthly fee or switch from monthly to yearly billing.
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.
There are three options available to add Third-party carrier-calculated shipping rates to your Shopify plan:
Option 1: activate feature for extra fee
The feature can be added to your monthly subscription on the Grow plan for an additional fee. We recommend contact Shopify Support to check it with them.
Option 2: switch to Grow annual plan
If you switch your Grow plan billing cycle from monthly to annual, the subscription cost will be discounted by 10%, and the feature will be included to your annual Grow plan for free. You should reach the Shopify support team right after you've updated your billing cycle. You can update your billing cycle any time here:
Settings > Plan > Change Plan
Option 3: switch to Shopify Advanced or Plus plan
The Third-party carrier-calculated rates feature is automatically included if you upgrade your Shopify to the Advanced or Plus plan.
How to enable third-party calculated rates at checkout
Your Shopify Store → Settings → Shipping and delivery → Carrier account.
Go to your store Settings, choose "Shipping and delivery" from the left menu, then scroll down to "Carrier accounts", click “Enable” or “Upgrade your plan”.
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