[BUG] APEX Generator - Invalid interface: OASTreasuryTransaction

Bug Report Checklist

• Have you provided a full/minimal spec to reproduce the issue?

  Using the full Stripe API spec.

• Have you validated the input using an OpenAPI validator (example)?

  I used the CLI with validate and it found no issues.

• Have you tested with the latest master to confirm the issue still exists?

  Yes

• Have you searched for related issues/PRs?

  Yes

• What's the actual output vs expected output?

Description

The generated code has errors as below:

 Error OASUpdateParams1TransferDataTest         Dependent class is invalid and needs recompilation:      
 Class OASUpdateParams1TransferData : Invalid interface: OASTransferData1 (16:54)
 Error OASUsBankAccountNetworks                 Expression cannot be assigned
 Error OASUsBankAccountNetworks                 Unexpected token '.'. (44:64)
 Error OASUsBankAccountNetworks                 Unexpected token 'List'. (44:45)
 Error OASUsBankAccountNetworks                 Unexpected token 'List'. (44:45)
 Error OASUsBankAccountNetworksTest             Invalid type: SupportedEnum (75:29)

It generates a class but instead of using the class as a property in POJO, the class is used as an interface.

public class OASUpdateParams1TransferData implements OASTransferData1, OASBusinessProfileSpecsSupportUrlAny {}

Where a List of Enum's is used in Example, it generates incorrect code.

usBankAccountNetworks.supported = List<SupportedEnum>.LIST_SUPPORTEDENUM_NEW_LIST_STRING_ACH_;

openapi-generator version

6.2.1 via Java JAR (Includes the fix locally done in bug reference below)

OpenAPI declaration file content or url

https://raw.githubusercontent.com/stripe/openapi/master/openapi/spec3.json

Generation Details

Steps to reproduce

1. java -jar openapi-generator-cli.jar generate -i https://raw.githubusercontent.com/stripe/openapi/master/openapi/spec3.json -g apex

Related issues/PRs

Includes the bug fix (suggested) reported in this bug below:
https://github.com/OpenAPITools/openapi-generator/issues/13571

Run the documented Java JAR command with the Stripe OpenAPI spec URL and the apex generator to reproduce the reported compiler errors. Inspect the Apex generator entry points and generated classes named in the report, including OASUpdateParams1TransferData and OASUsBankAccountNetworks; done means the generated code no longer uses invalid interfaces or malformed List-of-enum assignments.