feat(stripe): 💳 added Stripe integration for payments

backoffice/src/stripe/index.ts

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+export * from './stripe.module';
+export * from './stripe.service';

backoffice/src/stripe/stripe.module.ts

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+import { Module, Global } from '@nestjs/common';
+import { ConfigModule } from '@nestjs/config';
+import { StripeService } from './stripe.service';
+
+@Global()
+@Module({
+    imports: [ConfigModule],
+    providers: [StripeService],
+    exports: [StripeService],
+})
+export class StripeModule { }

backoffice/src/stripe/stripe.service.ts

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+import { Injectable, OnModuleInit } from '@nestjs/common';
+import { ConfigService } from '@nestjs/config';
+import Stripe from 'stripe';
+
+@Injectable()
+export class StripeService implements OnModuleInit {
+    private stripe: Stripe;
+
+    constructor(private configService: ConfigService) { }
+
+    onModuleInit() {
+        const secretKey = this.configService.get<string>('STRIPE_SECRET_KEY');
+        if (!secretKey) {
+            console.warn('STRIPE_SECRET_KEY not configured');
+            return;
+        }
+        this.stripe = new Stripe(secretKey, { apiVersion: '2024-11-20.acacia' });
+    }
+
+    getClient(): Stripe { return this.stripe; }
+
+    async createCustomer(email: string, name: string) {
+        return this.stripe.customers.create({ email, name });
+    }
+
+    async createSubscription(customerId: string, priceId: string) {
+        return this.stripe.subscriptions.create({
+            customer: customerId,
+            items: [{ price: priceId }],
+            payment_behavior: 'default_incomplete',
+            expand: ['latest_invoice.payment_intent'],
+        });
+    }
+
+    async cancelSubscription(subscriptionId: string) {
+        return this.stripe.subscriptions.cancel(subscriptionId);
+    }
+
+    async listSubscriptions(customerId: string) {
+        return this.stripe.subscriptions.list({ customer: customerId, status: 'all' });
+    }
+
+    async createCheckoutSession(customerId: string, priceId: string, successUrl: string, cancelUrl: string) {
+        return this.stripe.checkout.sessions.create({
+            customer: customerId,
+            payment_method_types: ['card'],
+            line_items: [{ price: priceId, quantity: 1 }],
+            mode: 'subscription',
+            success_url: successUrl,
+            cancel_url: cancelUrl,
+        });
+    }
+
+    async createBillingPortalSession(customerId: string, returnUrl: string) {
+        return this.stripe.billingPortal.sessions.create({ customer: customerId, return_url: returnUrl });
+    }
+
+    constructWebhookEvent(body: Buffer, signature: string): Stripe.Event {
+        const secret = this.configService.get<string>('STRIPE_WEBHOOK_SECRET')!;
+        return this.stripe.webhooks.constructEvent(body, signature, secret);
+    }
+}