feat: integrate LemonSqueezy to subscription payment

packages/server/src/services/Subscription/LemonSqueezyService.ts

@@ -0,0 +1,37 @@
+import { Service } from 'typedi';
+import { createCheckout } from '@lemonsqueezy/lemonsqueezy.js';
+import { SystemUser } from '@/system/models';
+import { configureLemonSqueezy } from './utils';
+
+@Service()
+export class LemonSqueezyService {
+  /**
+   * Retrieves the LemonSqueezy checkout url.
+   * @param {number} variantId
+   * @param {SystemUser} user
+   */
+  async getCheckout(variantId: number, user: SystemUser) {
+    configureLemonSqueezy();
+
+    return createCheckout(process.env.LEMONSQUEEZY_STORE_ID!, variantId, {
+      checkoutOptions: {
+        embed: true,
+        media: true,
+        logo: true,
+      },
+      checkoutData: {
+        email: user.email,
+        custom: {
+          user_id: user.id + '',
+          tenant_id: user.tenantId + '',
+        },
+      },
+      productOptions: {
+        enabledVariants: [variantId],
+        redirectUrl: `http://localhost:4000/dashboard/billing/`,
+        receiptButtonText: 'Go to Dashboard',
+        receiptThankYouNote: 'Thank you for signing up to Lemon Stand!',
+      },
+    });
+  }
+}