Search VISA Dispute Management Guidelines for rules relevant to a dispute.

Args: scenario: Free-text description of the dispute (cardholder claim, merchant response, transaction type, etc.).

Returns: A ranked list of matching VISA rule candidates, each containing: condition_id – e.g. "13.1" title – section heading snippet – relevant text excerpt score – cosine similarity score (0–1, higher = more relevant)

Retrieve the dispute history for a merchant from the data warehouse.

Args: merchant_id: The merchant identifier (e.g. "MER-001").

Returns: A dict containing: merchant_id – the queried ID merchant_name – registered name (or None) total_cases – total number of dispute cases on record resolutions – breakdown: {merchant_won, merchant_lost, settled, pending} cases – list of individual case records (date, amount, type, res)