> ## 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.
# ACH lifecycle
> Every ACH transfer status and what moves it.
An ACH transfer starts in one of five non-final states:
* `pending_destination` while an information request is unanswered
* `pending_approval` while a required approver has not acted
* `in_review` during Slash review
* `scheduled` or `pending` before network submission
Cancel with `POST /v2/transfers/ach/{transferId}/cancel` while the transfer is
still pre-submission, including destination, approval, review, and scheduling
holds. If network submission wins the race, cancellation returns `409`.
Cancellation is idempotent after it succeeds.
`settled`, `canceled`, and `failed` are final for submission. A receiving bank
can still return a settled transfer later, moving it to `returned` and adding a
return Transaction id to `transactionIds`.
Poll `GET /v2/transfers/ach/{transferId}` or consume
`aggregated_transaction.create` and `aggregated_transaction.update` webhooks.
The webhook's `entityId` is a Transaction id. Retrieve that Transaction, read
its `transferId`, and then retrieve the current Transfer.