Problem

No public documentation explains how end users can verify the secure payment page IPFS CID. The deterministic build works and multiple verification channels exist or are planned (DNSLink, ENS), but there's no guide telling users what to check or how.

Proposed Solution

Add a verification guide to the docs covering:

1. What the CID is and why it matters
2. How to verify via DNSLink (pay.request.network) — already live
3. How to verify via ENS — once implemented
4. What to do if CIDs don't match across sources

Considerations

• Should be updated whenever a new verification channel is added
• ENS section can be a placeholder until that issue is completed
• Related: https://github.com/RequestNetwork/request-secure-payment/issues/82, https://github.com/RequestNetwork/request-secure-payment/issues/88 (build hash verification fixes)