I signed up to see how it works but I don't want to pay for it + a shipping carrier service just to ship a few letters once in a while. But there is no way to cancel the subscription so I don't get billed when the trial is over. Does anyone know how to do this? Thanks.
If you installed it from the app store then go to apps page in Shopify admin and uninstall it. This should cancel billing. If you get billed contact the developer.
If you're unable to cancel the subscription for the app directly through the app settings , there are two options you can take -
Are you currently looking for an app to cater to your shipping needs? If you're located in either the US, Canada or Australia, have you looked at using Shopify Shipping?
The key benefits of Shopify Shipping are:
We have a great guide with more information regarding Shopify Shipping - so definitely take a look into utilising this if you're located in the countries I've mentioned above.
If you're located elsewhere, feel free to take a look at the apps below that include API integration for different shipping carriers and shipping label features -