Update Custom Fields

Updates the value of one or more custom fields on one or more issues. Combinations of custom field and issue should be unique within the request.Apps can only perform this operation on [custom fields](https://developer.atlassian.com/platform/forge/manifest-reference/modules/jira-custom-field/) and [custom field types](https://developer.atlassian.com/platform/forge/manifest-reference/modules/jira-custom-field-type/) declared in their own manifests.**[Permissions](#permissions) ...