diff --git a/app/routes/api.orders.$orderId.invoice.tsx b/app/routes/api.orders.$orderId.invoice.tsx
index 1abe9c1..cc3f53c 100644
--- a/app/routes/api.orders.$orderId.invoice.tsx
+++ b/app/routes/api.orders.$orderId.invoice.tsx
@@ -3,6 +3,7 @@ import { authenticate } from "../shopify.server";
 import db from "../db.server";
 import { generateInvoice } from "../services/invoice/generateInvoice.server";
 import { cancelAndReissue } from "../services/invoice/cancelAndReissue.server";
+import { sendInvoiceEmail } from "../services/invoice/email.server";
 
 /**
  * GET  /api/orders/:orderId/invoice  → returns latest invoice metadata + history
@@ -60,6 +61,50 @@ export const action = async ({ request, params }: ActionFunctionArgs) => {
       return cors(Response.json({ ok: true, op, ...result }));
     }
 
+    if (op === "send") {
+      const orderGid = orderId.startsWith("gid://")
+        ? orderId
+        : `gid://shopify/Order/${orderId}`;
+      let invoice = await db.invoice.findFirst({
+        where: {
+          shopDomain: session.shop,
+          orderId: orderGid,
+          kind: "invoice",
+          cancelledAt: null,
+        },
+        orderBy: [{ version: "desc" }, { createdAt: "desc" }],
+      });
+      if (!invoice) {
+        const generated = await generateInvoice({
+          shopDomain: session.shop,
+          admin,
+          orderId,
+        });
+        invoice = await db.invoice.findUnique({ where: { id: generated.invoiceId } });
+      }
+      if (!invoice) throw new Error("Failed to materialise an invoice for this order.");
+      const sendResult = await sendInvoiceEmail({
+        shopDomain: session.shop,
+        invoiceId: invoice.id,
+      });
+      if (!sendResult.ok) {
+        return cors(
+          Response.json(
+            { ok: false, op: "send", error: sendResult.errorMessage ?? "Email send failed." },
+            { status: 422 },
+          ),
+        );
+      }
+      return cors(
+        Response.json({
+          ok: true,
+          op: "send",
+          invoiceNumber: invoice.invoiceNumber,
+          toAddress: sendResult.toAddress,
+        }),
+      );
+    }
+
     const result = await generateInvoice({
       shopDomain: session.shop,
       admin,
diff --git a/data/regen-RE-1001.pdf b/data/regen-RE-1001.pdf
new file mode 100644
index 0000000..7892605
Binary files /dev/null and b/data/regen-RE-1001.pdf differ
diff --git a/data/regen-RE-1002.pdf b/data/regen-RE-1002.pdf
new file mode 100644
index 0000000..d2a0219
Binary files /dev/null and b/data/regen-RE-1002.pdf differ
diff --git a/data/sample-rechnung.pdf b/data/sample-rechnung.pdf
index 31553f0..750ec80 100644
Binary files a/data/sample-rechnung.pdf and b/data/sample-rechnung.pdf differ
diff --git a/data/sample-storno.pdf b/data/sample-storno.pdf
index f0c1cfa..514d4e3 100644
Binary files a/data/sample-storno.pdf and b/data/sample-storno.pdf differ
diff --git a/extensions/invoice-order-action/src/ActionExtension.tsx b/extensions/invoice-order-action/src/ActionExtension.tsx
index f74e192..c62754a 100644
--- a/extensions/invoice-order-action/src/ActionExtension.tsx
+++ b/extensions/invoice-order-action/src/ActionExtension.tsx
@@ -13,7 +13,7 @@ function Extension() {
   const orderGid: string | undefined = data?.selected?.[0]?.id;
   const orderId = orderGid ? orderGid.split("/").pop() : undefined;
 
-  async function trigger(action: "generate" | "cancel_reissue") {
+  async function trigger(action: "generate" | "cancel_reissue" | "send") {
     if (!orderId) {
       setError("No order selected");
       return;
@@ -47,6 +47,9 @@ function Extension() {
       <s-button slot="primary-action" onClick={() => trigger("generate")} disabled={busy}>
         Generate / regenerate
       </s-button>
+      <s-button slot="secondary-actions" onClick={() => trigger("send")} disabled={busy}>
+        Send invoice email
+      </s-button>
       <s-button slot="secondary-actions" tone="critical" onClick={() => trigger("cancel_reissue")} disabled={busy}>
         Cancel &amp; reissue
       </s-button>
diff --git a/shopify.app.toml b/shopify.app.toml
index 0dbcaf0..12c18d0 100644
--- a/shopify.app.toml
+++ b/shopify.app.toml
@@ -39,5 +39,4 @@ redirect_urls = [
 ]
 
 [build]
-include_config_on_deploy = true
 automatically_update_urls_on_dev = true