diff --git a/server/src/internal/customers/cancel/handleCancelV2.ts b/server/src/internal/customers/cancel/handleCancelV2.ts
new file mode 100644
index 000000000..c200ff511
--- /dev/null
+++ b/server/src/internal/customers/cancel/handleCancelV2.ts
@@ -0,0 +1,85 @@
+import type { UpdateSubscriptionV0Params } from "@autumn/shared";
+import { createRoute } from "@/honoMiddlewares/routeHandler";
+import { executeBillingPlan } from "@/internal/billing/v2/execute/executeBillingPlan";
+import { evaluateStripeBillingPlan } from "@/internal/billing/v2/providers/stripe/actionBuilders/evaluateStripeBillingPlan";
+import { logStripeBillingPlan } from "@/internal/billing/v2/providers/stripe/logs/logStripeBillingPlan";
+import { logStripeBillingResult } from "@/internal/billing/v2/providers/stripe/logs/logStripeBillingResult";
+import { computeUpdateSubscriptionPlan } from "@/internal/billing/v2/updateSubscription/compute/computeUpdateSubscriptionPlan";
+import { handleUpdateSubscriptionErrors } from "@/internal/billing/v2/updateSubscription/errors/handleUpdateSubscriptionErrors";
+import { logUpdateSubscriptionContext } from "@/internal/billing/v2/updateSubscription/logs/logUpdateSubscriptionContext";
+import { logUpdateSubscriptionPlan } from "@/internal/billing/v2/updateSubscription/logs/logUpdateSubscriptionPlan";
+import { setupUpdateSubscriptionBillingContext } from "@/internal/billing/v2/updateSubscription/setup/setupUpdateSubscriptionBillingContext";
+
+export const handleCancelV2 = createRoute({
+	// body: CancelBodySchema,
+	handler: async (c) => {
+		const ctx = c.get("ctx");
+		const { db, org, env } = ctx;
+		const {
+			customer_id,
+			product_id,
+			entity_id,
+			cancel_immediately = false,
+			prorate: bodyProrate = true,
+			customer_product_id,
+		} = await c.req.json();
+
+		const updateSubscriptionBody: UpdateSubscriptionV0Params = {
+			customer_id,
+			product_id,
+			entity_id,
+			cancel_action: cancel_immediately
+				? "cancel_immediately"
+				: "cancel_end_of_cycle",
+			billing_behavior: bodyProrate ? "prorate_immediately" : "next_cycle_only",
+		};
+
+		ctx.logger.info(
+			`=============== RUNNING CANCEL FOR ${customer_id} ===============`,
+		);
+
+		const billingContext = await setupUpdateSubscriptionBillingContext({
+			ctx,
+			params: updateSubscriptionBody,
+		});
+		logUpdateSubscriptionContext({ ctx, billingContext });
+
+		const autumnBillingPlan = await computeUpdateSubscriptionPlan({
+			ctx,
+			billingContext,
+			params: updateSubscriptionBody,
+		});
+		logUpdateSubscriptionPlan({ ctx, plan: autumnBillingPlan, billingContext });
+
+		await handleUpdateSubscriptionErrors({
+			ctx,
+			billingContext,
+			autumnBillingPlan,
+			params: updateSubscriptionBody,
+		});
+
+		const stripeBillingPlan = await evaluateStripeBillingPlan({
+			ctx,
+			billingContext,
+			autumnBillingPlan,
+		});
+		logStripeBillingPlan({ ctx, stripeBillingPlan, billingContext });
+
+		const billingResult = await executeBillingPlan({
+			ctx,
+			billingContext,
+			billingPlan: {
+				autumn: autumnBillingPlan,
+				stripe: stripeBillingPlan,
+			},
+		});
+
+		logStripeBillingResult({ ctx, result: billingResult.stripe });
+
+		return c.json({
+			success: true,
+			customer_id: customer_id,
+			product_id: product_id,
+		});
+	},
+});
diff --git a/server/src/internal/products/ProductService.ts b/server/src/internal/products/ProductService.ts
index f3f38fcd4..2e1a1f08c 100644
--- a/server/src/internal/products/ProductService.ts
+++ b/server/src/internal/products/ProductService.ts
@@ -14,7 +14,17 @@ import {
 import type { DrizzleCli } from "@server/db/initDrizzle";
 import RecaseError from "@server/utils/errorUtils";
 import { notNullish } from "@server/utils/genUtils";
-import { and, desc, eq, exists, inArray, ne, or, sql } from "drizzle-orm";
+import {
+	and,
+	desc,
+	eq,
+	exists,
+	inArray,
+	isNull,
+	ne,
+	or,
+	sql,
+} from "drizzle-orm";
 import { StatusCodes } from "http-status-codes";
 import { getLatestProducts } from "./productUtils";
 
@@ -131,7 +141,11 @@ export class ProductService {
 				eq(products.env, env),
 				eq(products.is_default, true),
 				ne(products.archived, true),
-				group ? eq(products.group, group) : undefined,
+				group === "" || group === null
+					? or(isNull(products.group), eq(products.group, ""))
+					: notNullish(group)
+						? eq(products.group, group)
+						: undefined,
 				inIds ? inArray(products.id, inIds) : undefined,
 			),
 			with: {
diff --git a/server/src/utils/scriptUtils/createTestProducts.ts b/server/src/utils/scriptUtils/createTestProducts.ts
index 25b644122..fb3df37b3 100644
--- a/server/src/utils/scriptUtils/createTestProducts.ts
+++ b/server/src/utils/scriptUtils/createTestProducts.ts
@@ -175,7 +175,7 @@ export const constructProduct = ({
 		is_add_on: isAddOn,
 		is_default: (type === "free" && isDefault) || forcePaidDefault,
 		version,
-		group: group || "",
+		group: group ?? null,
 		free_trial: freeTrialConfig as FreeTrial,
 		created_at: Date.now(),
 	};
diff --git a/server/tests/attach/others/others1.test.ts b/server/tests/attach/others/others1.test.ts
index a6066f7c8..80bfdabf5 100644
--- a/server/tests/attach/others/others1.test.ts
+++ b/server/tests/attach/others/others1.test.ts
@@ -1,5 +1,5 @@
-import { beforeAll, describe, expect, test } from "bun:test";
-import { type AppEnv, LegacyVersion, type Organization } from "@autumn/shared";
+import { beforeAll, describe, test } from "bun:test";
+import { LegacyVersion } from "@autumn/shared";
 import { attachAndExpectCorrect } from "@tests/utils/expectUtils/expectAttach.js";
 import {
 	expectDowngradeCorrect,
@@ -7,8 +7,6 @@ import {
 } from "@tests/utils/expectUtils/expectScheduleUtils.js";
 import ctx from "@tests/utils/testInitUtils/createTestContext.js";
 import chalk from "chalk";
-import type Stripe from "stripe";
-import type { DrizzleCli } from "@/db/initDrizzle.js";
 import { AutumnInt } from "@/external/autumn/autumnCli.js";
 import { constructProduct } from "@/utils/scriptUtils/createTestProducts.js";
 import { initCustomerV3 } from "@/utils/scriptUtils/testUtils/initCustomerV3.js";
@@ -46,6 +44,7 @@ describe(`${chalk.yellowBright(`${testCase}: Testing trials: pro with trial -> p
 			ctx,
 			products: [free, pro, premium],
 			prefix: testCase,
+			customerId,
 		});
 
 		const { testClockId: testClockId1 } = await initCustomerV3({
diff --git a/server/tests/integration/billing/update-subscription/cancel/end-of-cycle/cancel-end-of-cycle-edge-cases.test.ts b/server/tests/integration/billing/update-subscription/cancel/end-of-cycle/cancel-end-of-cycle-edge-cases.test.ts
index 56d8c3056..b2192a151 100644
--- a/server/tests/integration/billing/update-subscription/cancel/end-of-cycle/cancel-end-of-cycle-edge-cases.test.ts
+++ b/server/tests/integration/billing/update-subscription/cancel/end-of-cycle/cancel-end-of-cycle-edge-cases.test.ts
@@ -301,3 +301,107 @@ test.concurrent(`${chalk.yellowBright("cancel EOC edge: entity cancel -> uncance
 		productId: pro.id,
 	});
 });
+
+// ═══════════════════════════════════════════════════════════════════════════════
+// TEST 3: Cancel pro EOC with empty group - free default NOT scheduled
+// ═══════════════════════════════════════════════════════════════════════════════
+
+/**
+ * Scenario:
+ * - Free default product with prefixed group (standard behavior)
+ * - Pro product with group: "" (explicitly empty - no group)
+ * - User cancels Pro at end of cycle
+ *
+ * Expected Result:
+ * - Pro should be canceling
+ * - Free default should NOT be scheduled (different groups: "" vs prefixed)
+ * - After advancing to next cycle:
+ *   - Pro is removed
+ *   - Free is NOT present (wasn't scheduled because groups don't match)
+ */
+test.concurrent(`${chalk.yellowBright("cancel EOC edge: pro with empty group - free default NOT scheduled")}`, async () => {
+	const customerId = "cancel-eoc-empty-group-no-default";
+
+	const messagesItem = items.monthlyMessages({ includedUsage: 100 });
+
+	// Free is the default product - will get prefixed group from initScenario
+	const free = products.base({
+		id: "free",
+		items: [messagesItem],
+		isDefault: true,
+	});
+
+	// Pro with explicit empty group - should NOT match free's prefixed group
+	const pro = products.pro({
+		id: "pro",
+		items: [messagesItem],
+	});
+	// Explicitly set empty group (will be preserved due to our fix)
+	pro.group = "";
+
+	const { autumnV1, ctx, testClockId } = await initScenario({
+		customerId,
+		setup: [
+			s.customer({ paymentMethod: "success" }),
+			s.products({ list: [free, pro] }),
+		],
+		actions: [s.attach({ productId: pro.id })],
+	});
+
+	// Verify pro is active
+	const customerAfterAttach =
+		await autumnV1.customers.get<ApiCustomerV3>(customerId);
+	await expectProductActive({
+		customer: customerAfterAttach,
+		productId: pro.id,
+	});
+
+	// Cancel pro at end of cycle
+	await autumnV1.subscriptions.update({
+		customer_id: customerId,
+		product_id: pro.id,
+		cancel_action: "cancel_end_of_cycle",
+	});
+
+	// Verify pro is canceling and free is NOT scheduled (groups don't match)
+	const customerAfterCancel =
+		await autumnV1.customers.get<ApiCustomerV3>(customerId);
+
+	await expectCustomerProducts({
+		customer: customerAfterCancel,
+		canceling: [pro.id],
+		notPresent: [free.id], // Free should NOT be scheduled because groups don't match
+	});
+
+	// Advance to next billing cycle
+	await advanceToNextInvoice({
+		stripeCli: ctx.stripeCli,
+		testClockId: testClockId!,
+	});
+
+	// After advancing, pro should be gone and free should NOT be present
+	const customerAfterAdvance =
+		await autumnV1.customers.get<ApiCustomerV3>(customerId);
+
+	await expectProductNotPresent({
+		customer: customerAfterAdvance,
+		productId: pro.id,
+	});
+
+	// Free should also not be present (wasn't scheduled)
+	await expectProductNotPresent({
+		customer: customerAfterAdvance,
+		productId: free.id,
+	});
+
+	// No products should remain
+	expect(customerAfterAdvance.products.length).toBe(0);
+
+	// Verify no Stripe subscription exists
+	await expectNoStripeSubscription({
+		db: ctx.db,
+		customerId,
+		org: ctx.org,
+		env: ctx.env,
+	});
+});
diff --git a/server/tests/utils/testProductUtils/testProductUtils.ts b/server/tests/utils/testProductUtils/testProductUtils.ts
index 5f335c2de..08c8b1d57 100644
--- a/server/tests/utils/testProductUtils/testProductUtils.ts
+++ b/server/tests/utils/testProductUtils/testProductUtils.ts
@@ -20,8 +20,9 @@ export const addPrefixToProducts = ({
 	for (const product of products) {
 		product.id = `${product.id}_${prefix}`;
 		product.name = `${product.name} ${prefix}`;
-		// Only set group to prefix if not already defined
-		if (!product.group) {
+		// Only set group to prefix if not explicitly defined (null/undefined)
+		// Preserve empty string "" as an explicit "no group" value
+		if (product.group === null || product.group === undefined) {
 			product.group = prefix;
 		}
 	}