docs(docs): migrate GET /api/credits/get + GET /api/subscription/status

[arpitgupta1214]

Group 3 (Billing read) of the chat→api migration plan — documents the two account-scoped reads usePayment depends on.

Test plan

• npx mintlify@latest dev renders the new Billing group with both pages
• OpenAPI specs validate (jq parsed cleanly)

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: c39c7ce4-29af-4246-a53c-7290d9974e88

📥 Commits

Reviewing files that changed from the base of the PR and between 200bf15 and 15931c9.

📒 Files selected for processing (4)

• api-reference/billing/credits.mdx
• api-reference/billing/subscription-status.mdx
• api-reference/openapi/billing.json
• docs.json

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch migrate/billing-group3

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[cubic-dev-ai]

3 issues found across 4 files

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/openapi/billing.json">

<violation number="1" location="api-reference/openapi/billing.json:1">
P3: Custom agent: **Enforce Clear Code Style and Maintainability Practices**

New file exceeds the 100-line file limit required by Rule 2.</violation>

<violation number="2" location="api-reference/openapi/billing.json:19">
P1: `GET /api/credits/get` is documented as account-scoped but unauthenticated, which exposes billing data via `accountId` enumeration.</violation>

<violation number="3" location="api-reference/openapi/billing.json:57">
P1: `GET /api/subscription/status` is documented as unauthenticated while accepting `accountId`, enabling unauthorized subscription-status lookups.</violation>
</file>

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

[cubic-dev-ai]

P3: Custom agent: Enforce Clear Code Style and Maintainability Practices

New file exceeds the 100-line file limit required by Rule 2.

Prompt for AI agents

Check if this issue is valid — if so, understand the root cause and fix it. At api-reference/openapi/billing.json, line 1:

<comment>New file exceeds the 100-line file limit required by Rule 2.</comment>

<file context>
@@ -0,0 +1,166 @@
+{
+  "openapi": "3.1.0",
+  "info": {
</file context>