Release Notes

February 03, 2026

February 03, 2026 Karbon API release introduces the CustomField webhook type and a new filter parameter for the WorkItems endpoint.

New CustomField Webhook Type

We have introduced a new webhook type for

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CustomField
updates. You can now subscribe to events that notify you when Custom Field values are created or updated.

To subscribe to changes in Custom Field values, make a

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POST
request to
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/v3/WebhookSubscriptions
using the type
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CustomField
in the payload.

For example:

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{ "TargetUrl": "https://example.com/webhook", "WebhookType": "CustomField" }

Note: You will receive a webhook for each Custom Field value that is added or updated. This may result in a large number of notifications.

New WorkScheduleKey Filter for WorkItems Endpoint

You can now filter Work Items by their associated Work Schedule. Use the

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WorkScheduleKey
parameter in a
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GET
request to the
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/v3/WorkItems
endpoint.

For example:

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/v3/WorkItems?$filter=WorkScheduleKey eq 'FXcWYY9xZfd'