OnTheDot - Update booking with a new timeslot

[{"id":"5ff81b0e.a007e4","type":"onthedot-connection","z":"82e250b1.7d1db","name":"Red Ant","api_url":"https://sbapi.onthedot.com/api/v1.0","api_key":"1dOHtajAxKpCP0kLnc6BKMI6ZeQa"},{"id":"4c683b3f.b397c4","type":"onthedot-booking","z":"82e250b1.7d1db","creds":"5ff81b0e.a007e4","name":"Amend Booking","uuid":"","booking":{},"x":430,"y":113,"wires":[["936b83bf.6c948"]]},{"id":"5f17cc1a.a0e834","type":"inject","z":"82e250b1.7d1db","name":"","topic":"","payload":"","payloadType":"date","repeat":"","crontab":"","once":false,"x":93.5,"y":117,"wires":[["dc521785.23ade8"]]},{"id":"3ae77815.c51888","type":"function","z":"82e250b1.7d1db","name":"","func":"msg.payload = {\n    uuid: msg.payload.uuid,\n    booking: {\n      timeslot: {\n       timeslotId: msg.payload.timeslotId\n      },\n      webhook: \"\",\n      orderType: \"1\",\n      supplierId: \"CitySprint\",\n      accountNumber: \"W99969\",\n      serviceType: \"Y2\",\n      referenceNo: \"12\",\n      orderNo: msg.payload.order_id,\n      departmentReferenceNo: \"\",\n      store: {\n        storeId: \"RedAnt-01\",\n        instruction: \"test new instructions\",\n        info: {\n                openTime: \"10:30\",\n                closeTime: \"18:00\"\n            }\n     \n      },\n      consumer: {\n        name: \"test_user_1234_123456\",\n        email: \"test@test.com\",\n        mobileNumber: \"7777777777\",\n        address: {\n          firstLine: \"testaddress\",\n          secondLine: \"address2\",\n          city: \"House A\",\n          postCode: \"SE1 8NW\"\n        },\n        instruction: \"test9999999999\"\n      },\n      item: {\n        referenceNumber: \"123456\",\n        itemContentCount: 1,\n        weight: 0,\n        height: 0,\n        length: 0,\n        description: \"\",\n        readyAt: \"2016-03-17T10:00:00Z\"\n      },\n      notificationType: \"\"\n    }\n};\nreturn msg;","outputs":1,"noerr":0,"x":294.5,"y":188,"wires":[["4c683b3f.b397c4"]]},{"id":"936b83bf.6c948","type":"debug","z":"82e250b1.7d1db","name":"","active":true,"console":"false","complete":"false","x":643.5,"y":112,"wires":[]},{"id":"dc521785.23ade8","type":"function","z":"82e250b1.7d1db","name":"","func":"msg.payload = {\n    uuid: '31ac98b5-9d93-4ed9-ba9c-44cea1f1de71',\n    timeslotId: '54481-44mlte7s0ugw',\n    orderId: '17450380'\n    \n}\nreturn msg;","outputs":1,"noerr":0,"x":167.5,"y":188,"wires":[["3ae77815.c51888"]]}]