ai-bookkeeper paired each receipt with one bank line. Real spending is messier: a vendor bills a day's slips as one card charge, and the one-to-one matcher left every slip "unmatched" and the charge "missing a receipt".
After the one-to-one pass, a line that equals the exact sum of two to four unmatched receipts, all sharing a payee word with the line and dated inside the match window, now matches them as a group. If two different sets reach the same total, it matches neither and leaves the choice to you.
Tested on made-up slips only (20.00 + 15.50 against a 35.50 charge, an ambiguous case, and unrelated payees). No real batched card statement has been tried, and foreign-currency groups are not attempted.