docs(docs): migrate POST /api/stripe/portal/create

[arpitgupta1214]

Documents the new `POST /api/subscriptions/portal-sessions` endpoint that pairs with the existing `POST /api/subscriptions/sessions` to complete chat's stripe-outbound migration (group 4 of the chat→api migration plan).

Test plan

• `jq empty` validates both `accounts.json` and `docs.json`
• Mintlify preview renders the new page under Subscriptions

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 0baf2fed-2ccd-4ca6-b34c-e9f677a0176b

📥 Commits

Reviewing files that changed from the base of the PR and between 200bf15 and bab7126.

📒 Files selected for processing (5)

• api-reference/openapi/accounts.json
• api-reference/stripe/checkout-sessions-create.mdx
• api-reference/stripe/portal-sessions-create.mdx
• api-reference/subscriptions/sessions-create.mdx
• docs.json

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch migrate/stripe-group4

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[cubic-dev-ai]

No issues found across 3 files

[cubic-dev-ai]

1 issue found across 6 files (changes from recent commits).

Prompt for AI agents (unresolved issues)

Check if these issues are valid — if so, understand the root cause of each and fix them. If appropriate, use sub-agents to investigate and fix each issue separately.


<file name="api-reference/stripe/portal-sessions-create.mdx">

<violation number="1" location="api-reference/stripe/portal-sessions-create.mdx:3">
P2: The OpenAPI route in frontmatter targets `/api/stripe/portal-sessions`, but this migration is for `/api/subscriptions/portal-sessions`. Update the route so this page documents the correct endpoint.</violation>
</file>

_{Reply with feedback, questions, or to request a fix. Tag @cubic-dev-ai to re-run a review.}

[cubic-dev-ai]

P2: The OpenAPI route in frontmatter targets /api/stripe/portal-sessions, but this migration is for /api/subscriptions/portal-sessions. Update the route so this page documents the correct endpoint.

Prompt for AI agents

Check if this issue is valid — if so, understand the root cause and fix it. At api-reference/stripe/portal-sessions-create.mdx, line 3:

<comment>The OpenAPI route in frontmatter targets `/api/stripe/portal-sessions`, but this migration is for `/api/subscriptions/portal-sessions`. Update the route so this page documents the correct endpoint.</comment>

<file context>
@@ -0,0 +1,4 @@
+---
+title: 'Create Billing Portal Session'
+openapi: '/api-reference/openapi/accounts.json POST /api/stripe/portal-sessions'
+---
</file context>