feat: Create payment sessions (#6549)

~~Opening a draft PR to discuss a couple of implementation details that we should align on~~

**What**

Add workflow and API endpoint for creating payment sessions for a payment collection. Endpoint is currently `POST /store/payment-collection/:id/payment-sessions`. I suggested an alternative in a comment below.

Please note, we intentionally do not want to support creating payment sessions in bulk, as this would become a mess when having to manage multiple calls to third-party providers.

packages/payment/src/models/payment-collection.ts

@@ -84,12 +84,12 @@ export default class PaymentCollection {
   payment_providers = new Collection<PaymentProvider>(this)
 
   @OneToMany(() => PaymentSession, (ps) => ps.payment_collection, {
-    cascade: [Cascade.REMOVE],
+    cascade: [Cascade.PERSIST, "soft-remove"] as any,
   })
   payment_sessions = new Collection<PaymentSession>(this)
 
   @OneToMany(() => Payment, (payment) => payment.payment_collection, {
-    cascade: [Cascade.REMOVE],
+    cascade: [Cascade.PERSIST, "soft-remove"] as any,
   })
   payments = new Collection<Payment>(this)
 

packages/payment/src/models/payment-session.ts

@@ -54,19 +54,24 @@ export default class PaymentSession {
   })
   authorized_at: Date | null = null
 
+  @ManyToOne(() => PaymentCollection, {
+    persist: false,
+  })
+  payment_collection: PaymentCollection
+
   @ManyToOne({
     entity: () => PaymentCollection,
+    columnType: "text",
     index: "IDX_payment_session_payment_collection_id",
     fieldName: "payment_collection_id",
-    onDelete: "cascade",
+    mapToPk: true,
   })
-  payment_collection!: PaymentCollection
+  payment_collection_id: string
 
   @OneToOne({
     entity: () => Payment,
-    mappedBy: (payment) => payment.payment_session,
-    cascade: ["soft-remove"] as any,
     nullable: true,
+    mappedBy: "payment_session",
   })
   payment?: Payment | null
 

packages/payment/src/models/payment.ts

@@ -109,18 +109,26 @@ export default class Payment {
   captures = new Collection<Capture>(this)
 
   @ManyToOne({
+    entity: () => PaymentCollection,
+    persist: false,
+  })
+  payment_collection: PaymentCollection
+
+  @ManyToOne({
+    entity: () => PaymentCollection,
+    columnType: "text",
     index: "IDX_payment_payment_collection_id",
     fieldName: "payment_collection_id",
-    onDelete: "cascade",
+    mapToPk: true,
   })
-  payment_collection!: PaymentCollection
+  payment_collection_id: string
 
   @OneToOne({
     owner: true,
-    fieldName: "session_id",
+    fieldName: "payment_session_id",
     index: "IDX_payment_payment_session_id",
   })
-  payment_session!: PaymentSession
+  payment_session: PaymentSession
 
   /** COMPUTED PROPERTIES START **/