Configure account transaction category rates.
The endpoint does this by creating a new account transaction category or updating an existing one. In other words, if it finds an existing account transaction category with a matching account_id and transaction_category_id, it updates it. If it doesn't find a matching account transaction category, it creates a new one.
For an interest rate, for example fine_rate, the field fine_rate or fine_rate_multiplier_percent must be passed. You can pass one or the other but not both. This rule applies to all interest rate fields. However, you can combine fixed amounts and multipliers for different interest rates. Note that zero (0) is considered a valid value.
Note: This endpoint requires an account token - an access token encoded with a Pismo account ID. Tokens can expire quickly, which can result in a 401 Unauthorized message.