Webhook notification payload improvements

We have made a set of improvements in the BILL webhook notification payloads for consistency with other BILL v3 API responses.

• The createdTime and updatedTime value format is now consistent with the format in other BILL v3 API responses. The format is yyyy-MM-dd'T'HH:mm:ss.SSSX. For example, 2024-12-15T22:53:15.127+00:00.
• In the notification payloads for bills, the invoiceNumber and invoiceDate information is now in the invoice object. This matches the format of the /v3/bills API response.

See Webhooks for more information.