Initiate a flash swap order preview
| Name | Type | Description | Notes |
|---|---|---|---|
| preview_id | str | Preview result ID | [optional] |
| sell_currency | str | Currency to sell which can be retrieved from supported currency list API `GET /flash_swap/currencies` | [optional] |
| sell_amount | str | Amount to sell | [optional] |
| buy_currency | str | Currency to buy which can be retrieved from supported currency list API `GET /flash_swap/currencies` | [optional] |
| buy_amount | str | Amount to buy | [optional] |
| price | str | Price | [optional] |