### Fees Overview

To understand transfer fees when using Routefusion, there are a few simple rules to follow:

1. **Source Currency**: Fees are always charged in the source currency (`source_currency`) of the transfer.
2. **Source Amount**: Fees are always included in the source amount (`source_amount`) of the transfer.

#### Fee Calculation

- **When `source_amount` is applied**:
  - The fee is deducted from the `source_amount` before making the currency exchange.
  - **Example**: If `source_amount` is 100.00, the rate is 1.0, and the fee is 1.00, then the `destination_amount` will be returned as 99.00.
- **When `destination_amount` is applied**:
  - The fee is added to the `source_amount` required to fulfill the fee and the conversion to meet the `destination_amount`.
  - **Example**: If `destination_amount` is 100.00, the rate is 1.0, and the fee is 1.00, then the `source_amount` will return as 101.00.