Webhook Signature, Acceptance and Retries

Webhook Signature

Secured with HMAC-SHA256 signature.
Sezzle-Signature header contains a hash of the webhook body, generated using the merchant private key.
Always verify the signature matches the webhook data to confirm it originates from Sezzle.

Webhook Event Payload

Options
Template

uuid

string

Unique identifier for the webhook event.

created_at

string

Timestamp (ISO 8601) when the event was generated.

event

string

Type of the eventAvailable options: customer.tokenized, order.authorized, order.captured, order.refunded, dispute.merchant_input_requested, dispute.deadline_approaching, dispute.closed.customer_win, dispute.closed.merchant_win, dispute.closed.neutral

data_type

string

Type of data associated with the event.Available options: customer, order, dispute

data

object

Payload data specific to the event type. See options in the applicable accordion below.

{
    "uuid": string,
    "created_at": string,
    "event": string,
    "data_type": string,
    "data": {
        "token": string,
        "expiration": string,
        "customer": {
            "uuid": string,
            "created_at": string,
            "expiration": string
        }
    }
}

Examples per Event

customer.tokenized

{
    "uuid": "e41c32d5-687d-414f-b5c6-d089bea52e7d",
    "created_at": "2025-04-12T00:11:01.749261Z",
    "event": "customer.tokenized",
    "data_type": "tokenize",
    "data": {
        "token": "ce56604a-5dfd-489a-80e9-753d0325dd46",
        "expiration": "2025-04-12T00:41:01.745145Z",
        "customer": {
            "uuid": "e0003e6a-7234-4440-9265-61906e8b8879",
            "created_at": "2025-04-12T00:11:01.745145Z",
            "expiration": "2026-04-12T00:11:01.745145Z"
        }
    }
}

order.authorized

The "uuid" is the webhook UUID
The "data.uuid" is the order UUID that can be used on the API call to get order details
The "data.authorization.uuid" is the UUID for the authorization

{
    "uuid": "fdb263a1-a1dd-4feb-8749-c8a447977ebb",
    "created_at": "2025-04-12T00:15:39.281826Z",
    "event": "order.authorized",
    "data_type": "order",
    "data": {
        "uuid": "f36605a0-4a96-46d1-9d01-a0b17140dc57",
        "authorization": {
            "uuid": "28ef487d-8398-43bb-8354-5ebdd1eb7b40",
            "created_at": "2025-04-12T00:15:39.276841Z",
            "authorization_amount": {
                "amount_in_cents": 5000,
                "currency": "USD"
            },
            "approved": true,
            "expiration": "2025-04-12T00:45:39.276841Z"
        }
    }
}

order.captured

The "uuid" is the webhook UUID
The "data.uuid" is the order UUID that can be used on the API call to get order details
The "data.capture.uuid" is the UUID for the capture

{
    "uuid": "6ee025c6-8acf-48fe-a6d6-b51693d64c60",
    "created_at": "2025-04-12T00:20:07.44668Z",
    "event": "order.captured",
    "data_type": "order",
    "data": {
        "uuid": "b87305a1-6be3-4877-bcf0-2b5b7dfaeaf0",
        "capture": {
            "uuid": "b69b1ba8-e977-4f26-9253-06f14d941696",
            "created_at": "2025-04-12T00:20:07.438365Z",
            "amount": {
                "amount_in_cents": 3000,
                "currency": "USD"
            }
        }
    }
}

order.refunded

The "data.uuid" is the order UUID that can be used on the API call to get order details

Note on the source field:

If the value is "dashboard", it’s initiated from the merchant dashboard
If the value is "gateway", it’s via the gateway API

{
    "uuid": "ed89f046-f55e-4fdd-9f65-ec3d8e961f99",
    "created_at": "2025-04-12T00:24:39.809499Z",
    "event": "order.refunded",
    "data_type": "order",
    "data": {
        "uuid": "b69f882d-06c3-4f2e-b6e3-ce7a6c46e455",
        "refund": {
            "uuid": "479e9d25-d0a5-49df-a2d3-6ca1d75b8c57",
            "created_at": "2025-04-12T00:24:39.805651Z",
            "source": "dashboard",
            "amount": {
                "amount_in_cents": 500,
                "currency": "USD"
            }
        }
    }
}

dispute

The following applies to the following webhooks:

dispute.merchant_input_requested
dispute.deadline_approaching
dispute.closed.customer_win
dispute.closed.merchant_win
dispute.closed.neutral

{
    "uuid": "79f1e9cd-f1ef-42fa-b7b4-2ed8d9e9fae8",
    "created_at": "2025-04-11T17:22:22.717757Z",
    "event": "dispute.merchant_input_requested",
    "data_type": "dispute",
    "data": {
        "customer_name": "John Doe",
        "order_uuid": "e17280f3-d575-4bc2-99ff-ff881df7b137",
        "order_reference_id": "order-reference-id-123",
        "sezzle_order_id": "d2s7t-281qj-rf6ra-dqfcg",
        "order_date": "2024-08-20",
        "dispute_type": "No Product Or Service",
        "dispute_due_date": "2025-04-08",
        "dispute_id": 132,
        "dispute_amount_in_cents": 2500,
        "dispute_currency": "USD",
        "dispute_status": "Closed All Win"
    }
}

Webhook Acceptance and Retries

Considered delivered upon receiving an HTTP 200 Status OK response.
Non-200 responses trigger retries:
- Multiple attempts in the first hour.
- A few attempts throughout the day.
- Final attempts one day and three days later, spanning five days total.
If the final retry fails, the webhook subscription is deleted for all events.
To resume receiving webhooks, recreate the webhook.
Webhooks may not arrive in chronological order, as new ones can be sent before retries of older ones.
Retried webhooks use the current merchant private key for signing, so the signature may differ from the original if the key has changed.

API Reference

Tokenization

v1 (deprecated)

Webhook Signature, Acceptance and Retries