match_description and a category; all transactions matching the specified description will be placed in the chosen category.
Transaction rules override the default category MX gives to a transaction. Once a rule is created or updated, all past transactions with a matching cleansed description are placed in the partner-chosen category, and any future transactions will be placed in the chosen category as well.
For example, creating a rule with the match_description “Wal-mart” and the category_guid for “Groceries” will automatically apply that category_guid to any transaction with a matching description, including both existing and future transactions.
Partners must also provide a description when creating a transaction_rule. This string will replace all matched transactions’ description value.