Create a categorization rule

Creates a categorization rule in a Books instance: a rule that automatically categorizes imported transactions to a ledger, i.e. a general ledger (GL) account. The rule only applies to transactions categorized from now on; it does not re-categorize existing transactions. The body has conditions (1 to 10, all of which must match; logical AND, there is no OR) and outputs (at most one of each kind, so today exactly one setLedger), in the same shape getBooksCategorizationRules returns, so a listed rule's conditions and outputs can be sent back as is. Each condition has a tag and contents: amount (operator, one of lessThan, lessThanOrEqualTo, greaterThan, greaterThanOrEqualTo, or equalTo, and amount, a signed threshold in dollars: money in is positive and money out negative), description (contains), counterparty (name), debitCard (debitCardId), creditCard (creditCardId), user (userId), or customCategory (customCategoryId); every card, user, and custom category must belong to the organization. The only output is setLedger (ledgerId), a ledger the caller may edit (not read-only) in the Books instance; to find ledger IDs, use getBooksLedgers. There is no priority field: the new rule is placed among the existing rules by how specific its conditions are, and the first matching rule applies. Returns the created rule, in the shape getBooksCategorizationRules returns. A rule that doesn't validate, a ledger without a GL account, or conditions the organization already has a rule for are a 400 and create nothing; to see existing rules, use getBooksCategorizationRules.