diff --git a/server/tests/check/basic/check10.test.ts b/server/tests/check/basic/check10.test.ts
new file mode 100644
index 000000000..036680f4c
--- /dev/null
+++ b/server/tests/check/basic/check10.test.ts
@@ -0,0 +1,102 @@
+import { beforeAll, describe, expect, test } from "bun:test";
+import {
+	ApiVersion,
+	type CheckResponse,
+	type CheckResponseV0,
+	type LimitedItem,
+	SuccessCode,
+} from "@autumn/shared";
+import chalk from "chalk";
+import { TestFeature } from "tests/setup/v2Features.js";
+import ctx from "tests/utils/testInitUtils/createTestContext.js";
+import { AutumnInt } from "@/external/autumn/autumnCli.js";
+import { constructArrearItem } from "@/utils/scriptUtils/constructItem.js";
+import { constructProduct } from "@/utils/scriptUtils/createTestProducts.js";
+import { initCustomerV3 } from "@/utils/scriptUtils/testUtils/initCustomerV3.js";
+import { initProductsV0 } from "@/utils/scriptUtils/testUtils/initProductsV0.js";
+
+const messagesFeature = constructArrearItem({
+	featureId: TestFeature.Messages,
+	price: 0.5,
+	includedUsage: 100,
+	usageLimit: 500,
+}) as LimitedItem;
+
+const proProd = constructProduct({
+	type: "pro",
+	isDefault: false,
+	items: [messagesFeature],
+});
+
+const testCase = "check7";
+
+describe(`${chalk.yellowBright("check7: test /check with required balance")}`, () => {
+	const customerId = "check7";
+	const autumnV0: AutumnInt = new AutumnInt({ version: ApiVersion.V0_2 });
+	const autumnV1: AutumnInt = new AutumnInt({ version: ApiVersion.V1_2 });
+
+	beforeAll(async () => {
+		await initCustomerV3({
+			ctx,
+			customerId,
+			attachPm: "success",
+			withTestClock: false,
+		});
+
+		await initProductsV0({
+			ctx,
+			products: [proProd],
+			prefix: testCase,
+		});
+
+		await autumnV1.attach({
+			customer_id: customerId,
+			product_id: proProd.id,
+		});
+	});
+
+	test("v0 response", async () => {
+		const res = (await autumnV0.check({
+			customer_id: customerId,
+			feature_id: TestFeature.Messages,
+			required_balance: messagesFeature.usage_limit! + 1,
+		})) as unknown as CheckResponseV0;
+
+		expect(res.allowed).toBe(false);
+		expect(res.balances).toBeDefined();
+		expect(res.balances).toHaveLength(1);
+		expect(res.balances[0]).toMatchObject({
+			balance: messagesFeature.included_usage,
+			required: messagesFeature.usage_limit! + 1,
+			feature_id: TestFeature.Messages,
+		});
+	});
+
+	test("v1 response", async () => {
+		const res = (await autumnV1.check({
+			customer_id: customerId,
+			feature_id: TestFeature.Messages,
+			required_balance: messagesFeature.usage_limit! + 1,
+		})) as unknown as CheckResponse;
+
+		const expectedRes = {
+			allowed: false,
+			customer_id: customerId,
+			balance: messagesFeature.included_usage,
+			feature_id: TestFeature.Messages as string,
+			required_balance: messagesFeature.usage_limit! + 1,
+			code: SuccessCode.FeatureFound,
+			unlimited: false,
+			usage: 0,
+			included_usage: messagesFeature.included_usage,
+			overage_allowed: false,
+
+			usage_limit: messagesFeature.usage_limit!,
+			interval: "month",
+			interval_count: 1,
+		};
+
+		expect(res).toMatchObject(expectedRes);
+		expect(res.next_reset_at).toBeDefined();
+	});
+});
diff --git a/server/tests/check/basic/check8.test.ts b/server/tests/check/basic/check8.test.ts
new file mode 100644
index 000000000..41f20931d
--- /dev/null
+++ b/server/tests/check/basic/check8.test.ts
@@ -0,0 +1,102 @@
+import { beforeAll, describe, expect, test } from "bun:test";
+import {
+	ApiVersion,
+	type CheckResponse,
+	type CheckResponseV0,
+	type LimitedItem,
+	SuccessCode,
+} from "@autumn/shared";
+import chalk from "chalk";
+import { TestFeature } from "tests/setup/v2Features.js";
+import ctx from "tests/utils/testInitUtils/createTestContext.js";
+import { AutumnInt } from "@/external/autumn/autumnCli.js";
+import { constructArrearItem } from "@/utils/scriptUtils/constructItem.js";
+import { constructProduct } from "@/utils/scriptUtils/createTestProducts.js";
+import { initCustomerV3 } from "@/utils/scriptUtils/testUtils/initCustomerV3.js";
+import { initProductsV0 } from "@/utils/scriptUtils/testUtils/initProductsV0.js";
+
+const messagesFeature = constructArrearItem({
+	featureId: TestFeature.Messages,
+	price: 0.5,
+	includedUsage: 100,
+	usageLimit: 500,
+}) as LimitedItem;
+
+const proProd = constructProduct({
+	type: "pro",
+	isDefault: false,
+	items: [messagesFeature],
+});
+
+const testCase = "check7";
+
+describe(`${chalk.yellowBright("check7: test /check on feature with credit system")}`, () => {
+	const customerId = "check7";
+	const autumnV0: AutumnInt = new AutumnInt({ version: ApiVersion.V0_2 });
+	const autumnV1: AutumnInt = new AutumnInt({ version: ApiVersion.V1_2 });
+
+	beforeAll(async () => {
+		await initCustomerV3({
+			ctx,
+			customerId,
+			attachPm: "success",
+			withTestClock: false,
+		});
+
+		await initProductsV0({
+			ctx,
+			products: [proProd],
+			prefix: testCase,
+		});
+
+		await autumnV1.attach({
+			customer_id: customerId,
+			product_id: proProd.id,
+		});
+	});
+
+	test("v0 response", async () => {
+		const res = (await autumnV0.check({
+			customer_id: customerId,
+			feature_id: TestFeature.Messages,
+			required_balance: messagesFeature.usage_limit! + 1,
+		})) as unknown as CheckResponseV0;
+
+		expect(res.allowed).toBe(false);
+		expect(res.balances).toBeDefined();
+		expect(res.balances).toHaveLength(1);
+		expect(res.balances[0]).toMatchObject({
+			balance: messagesFeature.included_usage,
+			required: messagesFeature.usage_limit! + 1,
+			feature_id: TestFeature.Messages,
+		});
+	});
+
+	test("v1 response", async () => {
+		const res = (await autumnV1.check({
+			customer_id: customerId,
+			feature_id: TestFeature.Messages,
+			required_balance: messagesFeature.usage_limit! + 1,
+		})) as unknown as CheckResponse;
+
+		const expectedRes = {
+			allowed: false,
+			customer_id: customerId,
+			balance: messagesFeature.included_usage,
+			feature_id: TestFeature.Messages as string,
+			required_balance: messagesFeature.usage_limit! + 1,
+			code: SuccessCode.FeatureFound,
+			unlimited: false,
+			usage: 0,
+			included_usage: messagesFeature.included_usage,
+			overage_allowed: false,
+
+			usage_limit: messagesFeature.usage_limit!,
+			interval: "month",
+			interval_count: 1,
+		};
+
+		expect(res).toMatchObject(expectedRes);
+		expect(res.next_reset_at).toBeDefined();
+	});
+});
diff --git a/server/tests/check/basic/check9.test.ts b/server/tests/check/basic/check9.test.ts
new file mode 100644
index 000000000..b64f7516b
--- /dev/null
+++ b/server/tests/check/basic/check9.test.ts
@@ -0,0 +1,102 @@
+import { beforeAll, describe, expect, test } from "bun:test";
+import {
+	ApiVersion,
+	type CheckResponse,
+	type CheckResponseV0,
+	type LimitedItem,
+	SuccessCode,
+} from "@autumn/shared";
+import chalk from "chalk";
+import { TestFeature } from "tests/setup/v2Features.js";
+import ctx from "tests/utils/testInitUtils/createTestContext.js";
+import { AutumnInt } from "@/external/autumn/autumnCli.js";
+import { constructArrearItem } from "@/utils/scriptUtils/constructItem.js";
+import { constructProduct } from "@/utils/scriptUtils/createTestProducts.js";
+import { initCustomerV3 } from "@/utils/scriptUtils/testUtils/initCustomerV3.js";
+import { initProductsV0 } from "@/utils/scriptUtils/testUtils/initProductsV0.js";
+
+const messagesFeature = constructArrearItem({
+	featureId: TestFeature.Messages,
+	price: 0.5,
+	includedUsage: 100,
+	usageLimit: 500,
+}) as LimitedItem;
+
+const proProd = constructProduct({
+	type: "pro",
+	isDefault: false,
+	items: [messagesFeature],
+});
+
+const testCase = "check7";
+
+describe(`${chalk.yellowBright("check7: test /check on credit system (alone)")}`, () => {
+	const customerId = "check7";
+	const autumnV0: AutumnInt = new AutumnInt({ version: ApiVersion.V0_2 });
+	const autumnV1: AutumnInt = new AutumnInt({ version: ApiVersion.V1_2 });
+
+	beforeAll(async () => {
+		await initCustomerV3({
+			ctx,
+			customerId,
+			attachPm: "success",
+			withTestClock: false,
+		});
+
+		await initProductsV0({
+			ctx,
+			products: [proProd],
+			prefix: testCase,
+		});
+
+		await autumnV1.attach({
+			customer_id: customerId,
+			product_id: proProd.id,
+		});
+	});
+
+	test("v0 response", async () => {
+		const res = (await autumnV0.check({
+			customer_id: customerId,
+			feature_id: TestFeature.Messages,
+			required_balance: messagesFeature.usage_limit! + 1,
+		})) as unknown as CheckResponseV0;
+
+		expect(res.allowed).toBe(false);
+		expect(res.balances).toBeDefined();
+		expect(res.balances).toHaveLength(1);
+		expect(res.balances[0]).toMatchObject({
+			balance: messagesFeature.included_usage,
+			required: messagesFeature.usage_limit! + 1,
+			feature_id: TestFeature.Messages,
+		});
+	});
+
+	test("v1 response", async () => {
+		const res = (await autumnV1.check({
+			customer_id: customerId,
+			feature_id: TestFeature.Messages,
+			required_balance: messagesFeature.usage_limit! + 1,
+		})) as unknown as CheckResponse;
+
+		const expectedRes = {
+			allowed: false,
+			customer_id: customerId,
+			balance: messagesFeature.included_usage,
+			feature_id: TestFeature.Messages as string,
+			required_balance: messagesFeature.usage_limit! + 1,
+			code: SuccessCode.FeatureFound,
+			unlimited: false,
+			usage: 0,
+			included_usage: messagesFeature.included_usage,
+			overage_allowed: false,
+
+			usage_limit: messagesFeature.usage_limit!,
+			interval: "month",
+			interval_count: 1,
+		};
+
+		expect(res).toMatchObject(expectedRes);
+		expect(res.next_reset_at).toBeDefined();
+	});
+});