> ## Documentation Index
> Fetch the complete documentation index at: https://docs.slash.com/llms.txt
> Use this file to discover all available pages before exploring further.
# Sending book transfers
> Move money between virtual accounts in the same account.
A book transfer moves money between two virtual accounts and produces two
transactions: a debit from the source balance and a credit to the destination
balance.
Both virtual accounts must belong to the same Account.
Creating a book transfer requires a user API key with book-transfer
access, used from an allowlisted IP. `amount.amount` is in minor units, so
`250000` USD means USD 2,500.00.
```bash theme={null}
curl https://api.slash.com/v2/transfers/book \
-X POST \
-H "X-API-Key: $SLASH_API_KEY" \
-H "x-legal-entity: $SLASH_LEGAL_ENTITY_ID" \
-H "X-Idempotency-Key: payroll-funding-2026-08" \
-H "Content-Type: application/json" \
-d '{
"amount": { "amount": 250000, "currency": "USD" },
"fromAccount": "subaccount_operations123",
"toAccount": "subaccount_payroll123",
"description": "August payroll funding"
}'
```
The returned Transfer uses a `transfer_intent_` id and lists both ledger legs.
This example shows a completed transfer; a create response can instead be
`pending` or `in_review`:
```json theme={null}
{
"id": "transfer_intent_book123",
"type": "book",
"status": "settled",
"accountId": "sa_group_primary123",
"fromAccount": "subaccount_operations123",
"toAccount": "subaccount_payroll123",
"amount": { "amount": 250000, "currency": "USD" },
"description": "August payroll funding",
"transactionIds": [
"agg_tx_booksource123",
"agg_tx_bookdestination123"
],
"createdAt": "2026-08-18T01:00:00.000Z"
}
```
Use `GET /v2/transfers/book/{transferId}` for the Transfer and
`GET /v2/transactions?transferId=…` to reconcile both account impacts.
