Add Lemon Squeezy Billing System

packages/billing/lemon-squeezy/src/services/create-lemon-squeezy-billing-portal-session.ts

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+import { getCustomer } from '@lemonsqueezy/lemonsqueezy.js';
+import { z } from 'zod';
+
+import { CreateBillingPortalSessionSchema } from '@kit/billing/schema';
+
+import { initializeLemonSqueezyClient } from './lemon-squeezy-sdk';
+
+/**
+ * Creates a LemonSqueezy billing portal session for the given parameters.
+ *
+ * @param {object} params - The parameters required to create the billing portal session.
+ * @return {Promise<string>} - A promise that resolves to the URL of the customer portal.
+ * @throws {Error} - If no customer is found with the given customerId.
+ */
+export async function createLemonSqueezyBillingPortalSession(
+  params: z.infer<typeof CreateBillingPortalSessionSchema>,
+) {
+  await initializeLemonSqueezyClient();
+
+  const customer = await getCustomer(params.customerId);
+
+  if (!customer?.data) {
+    throw new Error('No customer found');
+  }
+
+  return customer.data.data.attributes.urls.customer_portal;
+}

packages/billing/lemon-squeezy/src/services/create-lemon-squeezy-checkout.ts

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+import {
+  NewCheckout,
+  createCheckout,
+  getCustomer,
+} from '@lemonsqueezy/lemonsqueezy.js';
+import { z } from 'zod';
+
+import { CreateBillingCheckoutSchema } from '@kit/billing/schema';
+
+import { getLemonSqueezyEnv } from '../schema/lemon-squeezy-server-env.schema';
+import { initializeLemonSqueezyClient } from './lemon-squeezy-sdk';
+
+/**
+ * Creates a checkout for a Lemon Squeezy product.
+ *
+ * @param {object} params - The parameters for creating the checkout.
+ * @return {Promise<object>} - A promise that resolves to the created Lemon Squeezy checkout.
+ * @throws {Error} - If no line items are found in the subscription.
+ */
+export async function createLemonSqueezyCheckout(
+  params: z.infer<typeof CreateBillingCheckoutSchema>,
+) {
+  await initializeLemonSqueezyClient();
+
+  const lineItem = params.plan.lineItems[0];
+
+  if (!lineItem) {
+    throw new Error('No line items found in subscription');
+  }
+
+  const env = getLemonSqueezyEnv();
+  const storeId = env.storeId;
+  const variantId = lineItem.id;
+
+  const urls = getUrls({
+    returnUrl: params.returnUrl,
+  });
+
+  const customer = params.customerId
+    ? await getCustomer(params.customerId)
+    : null;
+
+  let customerEmail = params.customerEmail;
+
+  // if we can find an existing customer using the ID,
+  // we use the email from the customer object so that we can
+  // link the previous subscription to this one
+  // otherwise it will create a new customer if another email is provided (ex. a different team member)
+  if (customer?.data) {
+    customerEmail = customer.data.data.attributes.email;
+  }
+
+  const newCheckout: NewCheckout = {
+    checkoutOptions: {
+      embed: true,
+      media: true,
+      logo: true,
+    },
+    checkoutData: {
+      email: customerEmail,
+      custom: {
+        account_id: params.accountId,
+      },
+    },
+    productOptions: {
+      redirectUrl: urls.return_url,
+    },
+    expiresAt: null,
+    preview: true,
+    testMode: process.env.NODE_ENV !== 'production',
+  };
+
+  return createCheckout(storeId, variantId, newCheckout);
+}
+
+function getUrls(params: { returnUrl: string }) {
+  const returnUrl = `${params.returnUrl}?session_id={CHECKOUT_SESSION_ID}`;
+
+  return {
+    return_url: returnUrl,
+  };
+}

packages/billing/lemon-squeezy/src/services/lemon-squeezy-billing-strategy.service.ts

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+import {
+  cancelSubscription,
+  createUsageRecord,
+  getCheckout,
+} from '@lemonsqueezy/lemonsqueezy.js';
+import 'server-only';
+import { z } from 'zod';
+
+import { BillingStrategyProviderService } from '@kit/billing';
+import {
+  CancelSubscriptionParamsSchema,
+  CreateBillingCheckoutSchema,
+  CreateBillingPortalSessionSchema,
+  ReportBillingUsageSchema,
+  RetrieveCheckoutSessionSchema,
+} from '@kit/billing/schema';
+
+import { createLemonSqueezyBillingPortalSession } from './create-lemon-squeezy-billing-portal-session';
+import { createLemonSqueezyCheckout } from './create-lemon-squeezy-checkout';
+
+export class LemonSqueezyBillingStrategyService
+  implements BillingStrategyProviderService
+{
+  async createCheckoutSession(
+    params: z.infer<typeof CreateBillingCheckoutSchema>,
+  ) {
+    const { data: response } = await createLemonSqueezyCheckout(params);
+
+    if (!response?.data.id) {
+      throw new Error('Failed to create checkout session');
+    }
+
+    return { checkoutToken: response.data.id };
+  }
+
+  async createBillingPortalSession(
+    params: z.infer<typeof CreateBillingPortalSessionSchema>,
+  ) {
+    const url = await createLemonSqueezyBillingPortalSession(params);
+
+    if (!url) {
+      throw new Error('Failed to create billing portal session');
+    }
+
+    return { url };
+  }
+
+  async cancelSubscription(
+    params: z.infer<typeof CancelSubscriptionParamsSchema>,
+  ) {
+    await cancelSubscription(params.subscriptionId);
+
+    return { success: true };
+  }
+
+  async retrieveCheckoutSession(
+    params: z.infer<typeof RetrieveCheckoutSessionSchema>,
+  ) {
+    const session = await getCheckout(params.sessionId);
+
+    if (!session.data) {
+      throw new Error('Failed to retrieve checkout session');
+    }
+
+    const data = session.data.data;
+
+    return {
+      checkoutToken: data.id,
+      isSessionOpen: false,
+      status: 'complete' as const,
+      customer: {
+        email: data.attributes.checkout_data.email,
+      },
+    };
+  }
+
+  async reportUsage(params: z.infer<typeof ReportBillingUsageSchema>) {
+    const { error } = await createUsageRecord({
+      quantity: params.usage.quantity,
+      subscriptionItemId: params.subscriptionId,
+    });
+
+    if (error) {
+      throw new Error('Failed to report usage');
+    }
+
+    return { success: true };
+  }
+}

packages/billing/lemon-squeezy/src/services/lemon-squeezy-sdk.ts

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+import 'server-only';
+
+import { Logger } from '@kit/shared/logger';
+
+import { getLemonSqueezyEnv } from '../schema/lemon-squeezy-server-env.schema';
+
+/**
+ * @description Initialize the Lemon Squeezy client
+ */
+export async function initializeLemonSqueezyClient() {
+  const { lemonSqueezySetup } = await import('@lemonsqueezy/lemonsqueezy.js');
+  const env = getLemonSqueezyEnv();
+
+  lemonSqueezySetup({
+    apiKey: env.secretKey,
+    onError(error) {
+      Logger.error(
+        {
+          name: `billing.lemon-squeezy`,
+          error: error.message,
+        },
+        'Error in Lemon Squeezy SDK',
+      );
+    },
+  });
+}