The notification kind, returned by calling
kind on the notification object, reveals what triggered the webhook. For a Grant API webhook,
$webhookNotification->kind will be one of the following:
The following table describes the conditions that trigger each kind of webhook.
A payment instrument that was previously granted to another Braintree merchant has been updated.
An object containing the payment method nonce, which represents the updated payment instrument.
See the Grant API webhooks guide for additional attributes specific to each webhook kind.
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