- Add proper inventory checking before crypto payment completion
- Implement sequential (FIFO) crypto payment processing to prevent race conditions
- Add comprehensive out-of-stock refund handling with two statuses:
- STATUS_OUT_OF_STOCK_REFUNDED: Full refund to customer (no restocking fee)
- STATUS_OUT_OF_STOCK_NO_REFUND: Sweep to shop when no refund address
- Use sweep_all with subaddr_indices for Monero to ensure complete fund recovery
- Use sendtoaddress with subtractfeefromamount for Dogecoin fee handling
- Add refund tracking fields (refund_reason, refund_tx_hash, refund_amount)
- Update MONERO.rst with subaddress isolation and refund processing documentation
- Ensure action buttons are removed for non-pending crypto quotes to prevent double payments
- Move CRYPTO.rst to docs/CRYPTO.rst
- Move CRYPTO_PROBLEMS.rst to docs/CRYPTO_PROBLEMS.rst
🤖 Generated with [Claude Code](https://claude.ai/code)
Co-Authored-By: Claude <noreply@anthropic.com>
