Cart Block: checkout validator

This a very promising app and beneficial for merchants who need to block certain customers or orders on their store.

The support team is absolutely amazing and took the time to meet with me to resolve some issues with the app. The reason we gave it 4 stars is because there are still some issues depending on how you decide to block customers (there are multiple scenarios you can choose from). This isn't necessarily an issue with the merchant itself as there are some limitations with developing an app for Shopify. However, if you run into any issues we recommend contacting them for a one-on-one call before giving up.

We highly recommend this app. There are not many options for this functionality (and honestly this may be the only one).