This guide will instruct you on how to restrict your shipping based on certain states. This is a two-part process which involves both your Shopify admin and ReCharge Shipping Settings.
You will need to log in to your Shopify account. From there, you will go to Settings and select Shipping and then Edit next to your United States shipping zone. If you don't have one already, you will need to create one first.
Click Edit again next to the United States (x of 62 states).
Select the states you want to ship to and exclude to restrict shipping.
Now go to your ReCharge Dashboard and select Settings and Shipping and scroll down Errors and change this to 'Display an error if no matching shipping rate is found'. This way, when customers attempt to purchase in an excluded state, they will be blocked.