Add Lemon Squeezy Billing System

packages/billing/core/src/schema/cancel-subscription-params.schema.ts

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+import { z } from 'zod';
+
+export const CancelSubscriptionParamsSchema = z.object({
+  subscriptionId: z.string(),
+  invoiceNow: z.boolean().optional(),
+});

packages/billing/core/src/schema/create-biling-portal-session.schema.ts

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+import { z } from 'zod';
+
+export const CreateBillingPortalSessionSchema = z.object({
+  returnUrl: z.string().url(),
+  customerId: z.string().min(1),
+});

packages/billing/core/src/schema/create-billing-checkout.schema.ts

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+import { z } from 'zod';
+
+import { PlanSchema } from '../create-billing-schema';
+
+export const CreateBillingCheckoutSchema = z.object({
+  returnUrl: z.string().url(),
+  accountId: z.string().uuid(),
+  plan: PlanSchema,
+  trialDays: z.number().optional(),
+  customerId: z.string().optional(),
+  customerEmail: z.string().email().optional(),
+});

packages/billing/core/src/schema/index.ts

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+export * from './create-billing-checkout.schema';
+export * from './create-biling-portal-session.schema';
+export * from './retrieve-checkout-session.schema';
+export * from './cancel-subscription-params.schema';
+export * from './report-billing-usage.schema';

packages/billing/core/src/schema/report-billing-usage.schema.ts

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+import { z } from 'zod';
+
+export const ReportBillingUsageSchema = z.object({
+  subscriptionId: z.string(),
+  usage: z.object({
+    quantity: z.number(),
+  }),
+});

packages/billing/core/src/schema/retrieve-checkout-session.schema.ts

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+import { z } from 'zod';
+
+export const RetrieveCheckoutSessionSchema = z.object({
+  sessionId: z.string(),
+});