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.changeset/spotty-teachers-enjoy.md

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+---
+'@shopify/shopify-app-remix': minor
+---
+
+Added v3_authenticatePublic feature flag to remove `authenticate.public(request)`.
+
+Apps can opt in to the new future at any time, so this is not a breaking change until version 3.
+
+  <details>
+    <summary>See an example</summary>
+
+Without the `v3_authenticatePublic` future flag the deprecated `authenticate.public(request)` is supported:
+
+```ts
+await authenticate.public.checkout(request);
+await authenticate.public.appProxy(request);
+
+// Deprecated.  Use authenticate.public.checkout(request) instead
+await authenticate.public(request);
+```
+
+With the `v3_authenticatePublic` future flag enabled the deprecated `authenticate.public(request)` is not supported:
+
+```ts
+await authenticate.public.checkout(request);
+await authenticate.public.appProxy(request);
+```
+
+  </details>