type: string
enum:
  - FX_FEE
  - PAYMENT_FEE
  - UNKNOWN_DEFAULT_OPEN_API
example: "FX_FEE"
description: |
  Type of the bank transaction fee.
  
  **Types:**
  - `FX_FEE`: A fee charged for currency conversion.
  - `PAYMENT_FEE`: A fee charged for processing a payment.
  - `UNKNOWN_DEFAULT_OPEN_API`: Unknown type value (fallback for future types)
