Custom Billing Declined Page

As of December 3rd 2018, Shopify has removed the ability for apps to handle their own declined billing process for all types of charges.

However, should there be an error in billing (such as a bad usage charge signature), an error page will show. A default view is provided by this package. To create your own, create resources/views/vendor/shopify-app/billing/error.blade.php. One variable is passed to the view, $message (usage: {{ $message }}), which contains the human-friendly error message.