docs: add mobile bundle ID whitelisting requirement for production

[devin-ai-integration]

Description

This PR addresses WAL-6167: Improve visibility on mobile SDK setup for production by adding critical mobile bundle ID whitelisting information to production setup sections across mobile SDK documentation.

Problem: Customers like Starshot were experiencing silent request failures when moving from staging to production because their mobile app identifiers (bundle IDs/package names) weren't whitelisted on production API keys. The existing documentation step was easy to miss, and staging doesn't enforce this requirement the same way production does.

Solution: Enhanced production setup documentation in three locations to prominently highlight the mobile bundle ID whitelisting requirement:

1. crossbit-main: Added step 3 and warning box to React Native quickstart production section
2. wallets-expo-quickstart: Enhanced "Using in production" section with detailed mobile app identifier requirements
3. crossmint-sdk: Added new "Production Setup" section to React Native SDK README

All changes include:

• Explicit warning about staging vs production enforcement differences
• Clear examples of bundle ID formats (iOS: com.company.appname, Android: com.company.appname)
• References to existing detailed documentation at /introduction/platform/api-keys/client-side#mobile-app-identifiers

Test plan

Documentation rendering:

• Verify the <Warning> component renders correctly in the React Native quickstart (crossbit-main)
• Test that all documentation links work and point to the correct sections
• Confirm consistent messaging across all three repositories

Technical accuracy verification:

• Validate mobile bundle ID format examples are correct
• Confirm the staging vs production enforcement differences described are accurate
• Verify the referenced documentation section exists and contains the detailed setup instructions

Manual testing: Documentation changes only - no code functionality to test.

Package updates

No package updates required - documentation changes only.

---

Link to Devin run: https://app.devin.ai/sessions/6807ee0813584eddb002dd391c7bb1d4
Requested by: Agus (agustin@paella.dev)

Human Review Checklist:

• Verify technical accuracy of bundle ID examples and staging/production differences
• Test all documentation links work correctly
• Confirm Warning component renders properly in MDX
• Check messaging consistency across the three repositories
• Validate that the changes address the root cause described in WAL-6167

[devin-ai-integration]

Original prompt from Agus

SYSTEM:
=== BEGIN THREAD HISTORY (in #help-wallets) ===
Pylon (U07V6DK170F): we should consider improving visibility around mobile client SDK setup: Starshot ran into confusion here:

* they were using the SDK in staging, everything worked fine
* once they moved to production, requests started failing silently, no clear auth errors
* root cause: their mobile bundle ID wasn't whitelisted on the production API key
* we do document this step here: <https://docs.crossmint.com/introduction/platform/api-keys/client-side#mobile-app-identifiers|https://docs.crossmint.com/introduction/platform/api-keys/client-side#mobile-app-identifiers>
* but it's easy to miss, especially since staging doesn't enforce it the same way

we could add this info in our quickstarts repos: <https://github.com/Crossmint/wallets-expo-quickstart/tree/main?tab=readme-ov-file#using-in-production|https://github.com/Crossmint/wallets-expo-quickstart/tree/main?tab=readme-ov-file#using-in-production>


Lars  |  Starshot #2236
<https://app.usepylon.com/issues?conversationID=bff80a54-9ab4-4df7-9da6-3f55a8ad5559|View in Pylon>  |  <https://crossmint.slack.com/archives/C0943MZM3T2/p1754503695393789?thread_ts=1754503695.393789&amp;cid=C0943MZM3T2|View in Slack>  |  :lock: Internal thread


Linear Asks (U064YQRSWJC): EmojiReactor created a new General Ask WAL-6167 Improve visibility on mobile SDK setup for production on behalf of Robin Curbelo

<@U08SHNFTXGE> created a new General Ask on behalf of *Robin Curbelo*

<https://linear.app/crossmint/issue/WAL-6167/improve-visibility-on-mobile-sdk-setup-for-production|WAL-6167 Improve visibility on mobile SDK setup for production>
we should consider improving visibility around mobile client SDK setup: Starshot ran into confusion here:
•  they were using the SDK in staging, everything worked fine
•  once they moved to production, requests started failing silently, no clear auth errors
•  root cause: their mobile bundle ID wasn't whitelisted on the production API key
•  ... (1017 chars truncated...)

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1 Skipped Deployment

Project	Deployment	Preview	Comments	Updated (UTC)
smart-wallet-auth-demo	Ignored			Aug 20, 2025 9:03pm