The service can optionally be limited to specific hours of the day. The calendar attribute needs to be present. Use weekly_allowance_plan to set both booking and working hours: { "calendar": { "weekly_allowance_plan": [ {}, { "isActive": true, "times": [{ "begin": "10:00", "end": "12:00" }] }, {}, {}, {}, { "isActive": true, "times": [{ "begin": "10:00", "end": "12:00" }] }, {} ], "region": "EUROPE", "timezone": "Europe/Berlin" } } Clear calendar: { "calendar": null } | Preserve existing: omit calendar field