Set optional checkout.session.url (#4569)

* Set optional checkout.session.url

* Lint

* Edit .env.example

* Vale CI

---------

Co-authored-by: Félix Malfait <felix.malfait@gmail.com>

packages/twenty-server/src/engine/modules/billing/billing.service.ts

@@ -131,10 +131,13 @@ export class BillingService {
     workspaceId: string,
     returnUrlPath?: string,
   ) {
-    const billingSubscription =
-      await this.billingSubscriptionRepository.findOneOrFail({
-        where: { workspaceId },
-      });
+    const billingSubscription = await this.getCurrentBillingSubscription({
+      workspaceId,
+    });
+
+    if (!billingSubscription) {
+      return;
+    }
 
     const frontBaseUrl = this.environmentService.get('FRONT_BASE_URL');
     const returnUrl = returnUrlPath
@@ -190,10 +193,9 @@ export class BillingService {
   }
 
   async deleteSubscription(workspaceId: string) {
-    const subscriptionToCancel =
-      await this.billingSubscriptionRepository.findOneBy({
-        workspaceId,
-      });
+    const subscriptionToCancel = await this.getCurrentBillingSubscription({
+      workspaceId,
+    });
 
     if (subscriptionToCancel) {
       await this.stripeService.cancelSubscription(

packages/twenty-server/src/engine/modules/billing/dto/session.entity.ts

@@ -2,6 +2,6 @@ import { Field, ObjectType } from '@nestjs/graphql';
 
 @ObjectType()
 export class SessionEntity {
-  @Field(() => String)
+  @Field(() => String, { nullable: true })
   url: string;
 }