What it is
The wholesale partner (acme-wholesale) places orders through POST /api/bulk-orders on web, which forwards to checkout with bulk=1. Bulk orders can have hundreds of lines.
Receipts
Checkout keeps the receipt of every bulk order in memory so the partner can re-download it from /receipts/<id>. The receipt cache has no size limit or expiry yet (ticket SHOP-412). Its size is reported as receipt_cache_entries.
Known risk
If the partner sends many large orders, the receipt cache grows quickly and checkout's memory follows. Until SHOP-412 ships, a restart clears the cache; the partner can ask support for older receipts.