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Delivered when a payment request expires before the customer pays. Expiry time is set via the expiresIn parameter when creating the payment request.
V2 Webhook Signing: If you have enabled V2 webhook signing, the signatureHash and signature fields are removed from the payload and an eventType field is added. The webhook signature is delivered in the X-Atoa-Signature HTTP header instead.
Only present when metadata was supplied on the payment. See Process Payment for the field limits.