# Internal transfers

Move trading balances between Polyester accounts without touching a chain.

`client.InternalTransfers` moves funds between Polyester accounts without touching a chain: from your source scope to another root account, a subaccount, or a smart-account address.

Transfers are idempotent on `idempotencyKey`: repeat requests with the same key return the existing transfer instead of creating a second one.

## Methods

| Method   | Summary                                             |
| -------- | --------------------------------------------------- |
| `Create` | Create (or return) an idempotent internal transfer. |

### Create(...)

Provide exactly one destination pointer: `destinationAccountID`, `destinationSubaccountID`, or `destinationSmartAccountAddress`.

```go
import "github.com/Fabric-Labs/polyester-sdk-go/models"

destSub := "123"
result, err := client.InternalTransfers.Create(
    ctx,
    2, // assetID
    models.AssetAmountFromDecimal("125.50"),
    "xfer-stable-1",
    nil, nil, // account / subAccountID source scope
    nil, &destSub, nil, // destination (one of three)
    nil, // quantityScale (default ledger 18)
)
if err != nil { log.Fatal(err) }
fmt.Println(result.TransferID, result.RequestID)
```

The request always carries canonical fixed-scale-18 `amount_e18`. `quantityScale` describes the input when the amount does not already carry scale metadata. Conversion is exact: overflow and non-exact downscaling are rejected, and the SDK never rounds.

## Related

- [Deposits & withdrawals guide](https://testnet.polyester.com/docs/sdk/go/guides/deposits-and-withdrawals)
- [Balances](https://testnet.polyester.com/docs/sdk/go/reference/balances)
- [Withdrawals](https://testnet.polyester.com/docs/sdk/go/reference/withdrawals)
- [Requests & idempotency](https://testnet.polyester.com/docs/sdk/go/concepts/requests-and-idempotency)