Easier billing messages and fewer link errors in Shopify setup

If you use Shopify with HandyPal, billing error messages are now simpler and easier to understand. This means if something goes wrong with billing, you'll get a clearer explanation rather than something confusing.

Also, the app now handles Shopify notifications better by fixing broken links that used to cause errors. This means things run smoother and you won’t see error pages when Shopify tries to send updates.

Overall, these fixes make your Shopify experience with HandyPal more reliable and straightforward.