feat(core-flows,payment,medusa,types): Refund reasons management API (#8436)

* feat(core-flows,payment,medusa,types): add ability to set and manage refund reasons

* fix(payment): validate total amount when refunding payment (#8437)

Co-authored-by: Carlos R. L. Rodrigues <37986729+carlos-r-l-rodrigues@users.noreply.github.com>

* feature: introduce additional_data to the product endpoints (#8405)

* chore(docs): Generated References (#8440)

Generated the following references:
- `product`

* chore: align payment database schema

* Update packages/core/core-flows/src/payment-collection/steps/create-refund-reasons.ts

Co-authored-by: Oli Juhl <59018053+olivermrbl@users.noreply.github.com>

* chore: address review

---------

Co-authored-by: Carlos R. L. Rodrigues <37986729+carlos-r-l-rodrigues@users.noreply.github.com>
Co-authored-by: Harminder Virk <virk.officials@gmail.com>
Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
Co-authored-by: Oli Juhl <59018053+olivermrbl@users.noreply.github.com>

packages/modules/payment/src/models/payment.ts

@@ -4,6 +4,7 @@ import {
   DALUtils,
   MikroOrmBigNumberProperty,
   Searchable,
+  createPsqlIndexStatementHelper,
   generateEntityId,
 } from "@medusajs/utils"
 import {
@@ -28,7 +29,13 @@ import Refund from "./refund"
 
 type OptionalPaymentProps = DAL.ModelDateColumns
 
-@Entity({ tableName: "payment" })
+const tableName = "payment"
+const ProviderIdIndex = createPsqlIndexStatementHelper({
+  tableName,
+  columns: "provider_id",
+})
+
+@Entity({ tableName })
 @Filter(DALUtils.mikroOrmSoftDeletableFilterOptions)
 export default class Payment {
   [OptionalProps]?: OptionalPaymentProps
@@ -46,6 +53,7 @@ export default class Payment {
   currency_code: string
 
   @Property({ columnType: "text" })
+  @ProviderIdIndex.MikroORMIndex()
   provider_id: string
 
   @Searchable()