Changed proof of payment download link from old route structure
/share/proof-of-payment/[id]/ to new structure
/share/proof-of-payment/combined/[id]/
This aligns with the reorganized route structure that separates
combined and per-bill proof of payment downloads.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>