Thanks to recent changes to the HTTP Cookie SameSite spec, Asp.Net cookies and AntiForgery tokens have stopped working in Shopify embedded apps and iframes.
Shopify has deprecated the first version of their API, necessitating a new major release of ShopifySharp. In this guide, I'll cover everything that's changed from v4 to v5, and some of the potential pitfalls you'll need to look out for.
Polaris is an excellent frontend framework with very good documentation (unlike Shopify's API docs!), but there's one thing in particular they don't document very well: how to get working propertly with React routing packages like Navi or React Router.