Helcim · AsyncAPI Specification

Helcim Webhooks

Version

View Spec View on GitHub PaymentsCanadaPayment GatewayPayment ProcessingAcquiringMerchant ServicesACHInvoicingCard TerminalSmall BusinessAsyncAPIEvents

AsyncAPI Specification

generated: '2026-07-24'
method: searched
source: https://devdocs.helcim.com/docs/webhooks + /docs/connected-account-webhooks
spec_type: Webhooks
delivery: 'HTTPS POST to a merchant-configured endpoint (dashboard: All Tools > Integrations > Webhooks;
  URL cannot contain "Helcim")'
signature:
  method: HMAC-SHA256
  signed_content: ${webhook-id}.${webhook-timestamp}.${body}
  key: base64-decoded verifierToken
  headers:
  - webhook-signature
  - webhook-timestamp
  - webhook-id
events:
- type: cardTransaction
  description: A card transaction was processed (Payment Hardware API).
  payload_example:
    id: '25764674'
    type: cardTransaction
- type: terminalCancel
  description: A payment was cancelled on a Smart Terminal device before processing.
  payload_example:
    type: terminalCancel
    data:
      cancelledAt: '2026-01-14T18:38:18Z'
      currency: CAD
      deviceCode: NBL7
      transactionAmount: 1
connected_account_webhooks:
  description: Partners are notified of API token values when a referred merchant signs up and is approved.
  docs: https://devdocs.helcim.com/docs/connected-account-webhooks

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