46 add stripe product endpoint (#4133)

* Add self billing feature flag

* Add two core tables for billing

* Remove useless imports

* Remove graphql decorators

* Rename subscriptionProduct table

* WIP: Add stripe config

* Add controller to get product prices

* Add billing service

* Remove unecessary package

* Simplify stripe service

* Code review returns

* Use nestjs param

* Rename subscription to basePlan

* Rename env variable

packages/twenty-server/src/integrations/environment/environment.service.ts

@@ -305,4 +305,15 @@ export class EnvironmentService {
       this.configService.get<number>('MUTATION_MAXIMUM_RECORD_AFFECTED') ?? 100
     );
   }
+
+  getBillingStripeBasePlanProductId(): string {
+    return (
+      this.configService.get<string>('BILLING_STRIPE_BASE_PLAN_PRODUCT_ID') ??
+      ''
+    );
+  }
+
+  getStripeApiKey(): string {
+    return this.configService.get<string>('STRIPE_API_KEY') ?? '';
+  }
 }