The only transfers that can be canceled are:
ACH and SDACH transfers can be cancelled if it has not yet been submitted to the processor. For more details, review the cutoff times.
Looking to cancel a transfer through Monitor? See this guide

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Steps To Cancel A Transfer

1

Request Cancel

2

Get Response

Communication on whether it was successful will be available via webhook or a GET call.
{
  "message": "The transfer cancellation request was successful."
}
Upon success, the transfer status will be updated to Failed.

​
Webhook Example

{
    "event_id": "cl0e13b9-7311-440b-828a-a5c13c4e342p",
    "event_type": "transfer_updated",
    "created_at": "2024-08-26T18:57:18.087Z",
    "event_data": {
        "transfer": {
            "id": "542dbbe3-cf18-4d94-a490-7dde26f5b5bp",
            "transfer_reference_id": "test",
            "amount": 200,
            "currency": "USD",
            "speed": "same_day",
            "destination": {
                "account_reference_id": "p7db1-2n38ywn",
                "customer_reference_id": "5jd29a-ja2qof612"
            },
            "status": "failed",
            "status_reasons": [
                {
                    "destination": {
                        "reason_code": "canceled_transfer",
                        "reason_code_message": "The transfer cancellation request was successful",
                    }
                }
            ]
        }
    }
}