Set Event Attribute Value

Sets one attribute value on the event, or clears it when value is null or blank. For MultiSelect the value is a JSON array string of the selected option values, and for MultiFile a JSON array string of objects with id and name. Filling a task tracked attribute advances its task, and a changed value runs the event type's value change effects. Needs event settings permission, or an organization token for an admin of the owning organization. To save several values at once use Events_UpdateEvent. The attribute id comes from Events_GetEventAttributeProfile.

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