first version

extensions/invoice-order-action/manifest.json

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+{
+  "admin.order-details.action.render": {
+    "main": "dist/invoice-action.js"
+  }
+}

extensions/invoice-order-action/package.json

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+{
+  "name": "invoice-order-action",
+  "version": "1.0.0",
+  "private": true,
+  "devDependencies": {
+    "@shopify/ui-extensions": "^2026.1.0",
+    "preact": "^10.22.0",
+    "typescript": "^5.6.0"
+  }
+}

extensions/invoice-order-action/shopify.d.ts

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+import '@shopify/ui-extensions';
+
+//@ts-ignore
+declare module './src/ActionExtension.tsx' {
+  const shopify: import('@shopify/ui-extensions/admin.order-details.action.render').Api;
+  const globalThis: { shopify: typeof shopify };
+}

extensions/invoice-order-action/shopify.extension.toml

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+api_version = "2026-01"
+
+[[extensions]]
+name = "Generate invoice"
+handle = "invoice-action"
+type = "ui_extension"
+uid = "linumiq-invoice-order-action"
+
+  [[extensions.targeting]]
+  target = "admin.order-details.action.render"
+  module = "./src/ActionExtension.tsx"

extensions/invoice-order-action/src/ActionExtension.tsx

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+import { render } from "preact";
+import { useState } from "preact/hooks";
+
+export default async () => {
+  render(<Extension />, document.body);
+};
+
+function Extension() {
+  const { close, data } = (globalThis as any).shopify;
+  const [busy, setBusy] = useState(false);
+  const [error, setError] = useState<string | null>(null);
+
+  const orderGid: string | undefined = data?.selected?.[0]?.id;
+  const orderId = orderGid ? orderGid.split("/").pop() : undefined;
+
+  async function trigger(action: "generate" | "cancel_reissue") {
+    if (!orderId) {
+      setError("No order selected");
+      return;
+    }
+    setBusy(true);
+    setError(null);
+    try {
+      const body = new URLSearchParams({ action });
+      const res = await fetch(`/api/orders/${orderId}/invoice`, {
+        method: "POST",
+        body,
+      });
+      if (!res.ok) {
+        const txt = await res.text();
+        throw new Error(`HTTP ${res.status}: ${txt.slice(0, 200)}`);
+      }
+      close();
+    } catch (e: any) {
+      setError(e?.message ?? "Failed");
+    } finally {
+      setBusy(false);
+    }
+  }
+
+  return (
+    <s-admin-action heading="Generate invoice" loading={busy}>
+      <s-stack gap="200">
+        <s-text>Create or regenerate the PDF invoice for this order. The file will be uploaded to Shopify Files and linked via order metafields.</s-text>
+        {error ? <s-banner tone="critical">{error}</s-banner> : null}
+      </s-stack>
+      <s-button slot="primary-action" onClick={() => trigger("generate")} disabled={busy}>
+        Generate / regenerate
+      </s-button>
+      <s-button slot="secondary-actions" tone="critical" onClick={() => trigger("cancel_reissue")} disabled={busy}>
+        Cancel &amp; reissue
+      </s-button>
+    </s-admin-action>
+  );
+}

extensions/invoice-order-action/tsconfig.json

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+{
+  "compilerOptions": {
+    "target": "ES2022",
+    "module": "ESNext",
+    "moduleResolution": "Bundler",
+    "lib": ["DOM", "DOM.Iterable", "ES2022"],
+    "jsx": "react-jsx",
+    "jsxImportSource": "preact",
+    "strict": true,
+    "skipLibCheck": true,
+    "isolatedModules": true,
+    "noEmit": true,
+    "resolveJsonModule": true,
+    "allowSyntheticDefaultImports": true,
+    "esModuleInterop": true
+  },
+  "include": ["src/**/*"]
+}