In Sequence, you can listen to various events to trigger your own workflows, such as changes to customer details, updates to an invoice, etc.

Use the Notifications policy endpoint to set up custom webhooks or configure a policy via the dashboard in Settings > Notifications.

Sequence will send a POST request to the URL provided in the notification policy. The request body will contain the event details, as well as the resource that relates to the event.

When a webhook policy is created, you will be provided with a secret key. This key can used to verify the authenticity of the request. You can find the secret key in the dashboard or in the response body when creating a policy via the API.

All webhooks contain a JSON payload and a sequence-signature header, consisting of a timestamp (t=17301212441) and a secret (s=abc123def...).

To validate the webhook:

  • Append the timestamp to the request body separated by a . (e.g. 17301212441.{"notificationType"="CUSTOMER_CREATED", ...})
  • Hash the result using HMAC-SHA256 with the secret key
  • Compare the resulting hash with the secret in the sequence-signature header

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Event types

  • CUSTOMER_CREATED
  • CUSTOMER_UPDATED
  • CUSTOMER_ARCHIVED
  • INVOICE_CREATED
  • INVOICE_ISSUED
  • INVOICE_UPDATED
  • MERCHANT_UPDATED
  • BILLING_SCHEDULE_CREATED
  • BILLING_SCHEDULE_UPDATED
  • BILLING_SCHEDULE_ARCHIVED
  • CREDIT_NOTE_CREATED
  • CREDIT_NOTE_UPDATED
  • CREDIT_NOTE_ISSUED
  • QUOTE_PUBLISHED
  • QUOTE_ACCEPTED
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