docs: add changelog page with sandbox card issuance and new country coverage

[pengying]

Summary

Adds a Changelog page to the Grid API docs, surfaced as a new top-level Changelog tab.

The initial entry (July 2026) covers:

• Card issuance in sandbox — you can now test the full card lifecycle in sandbox before going live.
• Expanded country coverage — additional countries including China, broadening global payment corridors.

Changes

• mintlify/changelog.mdx — new page using Mintlify's <Update> component, with links to the relevant cards and currencies/rails docs.
• mintlify/docs.json — added the Changelog tab to navigation.

Notes

Preview locally with cd mintlify && mint dev. The repo's make lint-markdown target references a missing npm script (pre-existing, unrelated); docs.json was validated as valid JSON.

🤖 Generated with Claude Code

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2 Skipped Deployments

Project	Deployment	Actions	Updated (UTC)
grid-flow-builder	Ignored	Preview	Jul 6, 2026 9:38pm
grid-wallet-demo	Ignored	Preview	Jul 6, 2026 9:38pm

[mintlify]

Preview deployment for your docs. Learn more about Mintlify Previews.

Project	Status	Preview	Updated (UTC)
Grid	🟢 Ready	View Preview	Jul 6, 2026, 9:44 PM

[pengying]

• docs: add changelog page with sandbox card issuance and new country coverage #648 👈 (View in Graphite)
• main

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[greptile-apps]

Greptile Summary

Adds a Changelog top-level tab to the Grid API docs with a single July 2026 entry covering card issuance in sandbox and expanded country coverage.

• mintlify/changelog.mdx — new page using the <Update> component; all six internal links resolve to existing pages, the icon SVG is present, and frontmatter is complete.
• mintlify/docs.json — injects a "Changelog" tab between the Cards tab and the API reference tab, following the existing navigation pattern.

Confidence Score: 5/5

Documentation-only change adding a new Changelog tab and MDX page; all internal links resolve, the icon file exists, and navigation follows the established pattern.

Both files are straightforward documentation additions. Every internal link points to a page confirmed to exist, the icon SVG is present in the repo, frontmatter is complete, and the docs.json change is structurally consistent with every other tab. No logic, API, or runtime behavior is affected.

No files require special attention.

Important Files Changed

Filename	Overview
mintlify/changelog.mdx	New changelog page; frontmatter complete, all internal links valid, heading case correct, component used appropriately.
mintlify/docs.json	Changelog tab inserted before API reference with a single-group/single-page structure consistent with other tabs.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A[docs.json navigation] --> B[Guides tab]
    A --> C[Cards tab]
    A --> D["Changelog tab ✨ NEW"]
    A --> E[API reference tab]

    D --> F["Group: Changelog"]
    F --> G["Page: changelog.mdx"]

    G --> H["Update: July 2026"]
    H --> I["Card issuance in sandbox\n→ /cards/platform-tools/sandbox-testing"]
    H --> J["Expanded country coverage\n→ /platform-overview/core-concepts/currencies-and-rails"]

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%%{init: {'theme': 'base', 'themeVariables': {"darkMode": true, "background": "#0d1117", "primaryColor": "#21262d", "primaryTextColor": "#e6edf3", "primaryBorderColor": "#8b949e", "lineColor": "#8b949e", "textColor": "#e6edf3", "edgeLabelBackground": "#161b22", "actorBkg": "#21262d", "actorBorder": "#8b949e", "actorTextColor": "#e6edf3", "actorLineColor": "#8b949e", "signalColor": "#8b949e", "signalTextColor": "#e6edf3", "noteBkgColor": "#373320", "noteBorderColor": "#d4a72c", "noteTextColor": "#f0e6c0", "labelBoxBkgColor": "#21262d", "labelBoxBorderColor": "#8b949e", "labelTextColor": "#e6edf3", "loopTextColor": "#e6edf3", "activationBkgColor": "#30363d", "activationBorderColor": "#8b949e"}}}%%
flowchart TD
    A[docs.json navigation] --> B[Guides tab]
    A --> C[Cards tab]
    A --> D["Changelog tab ✨ NEW"]
    A --> E[API reference tab]

    D --> F["Group: Changelog"]
    F --> G["Page: changelog.mdx"]

    G --> H["Update: July 2026"]
    H --> I["Card issuance in sandbox\n→ /cards/platform-tools/sandbox-testing"]
    H --> J["Expanded country coverage\n→ /platform-overview/core-concepts/currencies-and-rails"]

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