Initiate a flash swap order preview
| Name | Type | Description | Notes |
|---|---|---|---|
| previewId | String | Preview result ID | [optional] |
| sellCurrency | String | Currency to sell which can be retrieved from supported currency list API `GET /flash_swap/currencies` | [optional] |
| sellAmount | String | Amount to sell | [optional] |
| buyCurrency | String | Currency to buy which can be retrieved from supported currency list API `GET /flash_swap/currencies` | [optional] |
| buyAmount | String | Amount to buy | [optional] |
| price | String | Price | [optional] |