Needing help on adding carrier shipping API to my website as I would like to use the app ' Delivery Rate by Zip Code' by Zapiet.
I am currently on the middle shopfiy plan and have set me plan to annual billing, but not sure how to go about adding calculated shipping added to my shopify plan.
If you have switched your Shopify plan to annual billing, you're eligible to have the Carrier Service API enabled for free. Please, make sure to ask them directly to enable this API, as they do not always do it automatically when switching the billing option.
Once the Carrier Service API is enabled, then you'll be able to configure your Delivery Rates by Zip Code app and add it to your Shopify Shipping profile, in order for it to generate rates at checkout
Don't hesitate to contact us at firstname.lastname@example.org, or through our online chat, if you have more questions.