hottub_rest_sensors.yaml

sensor:
  - platform: rest
    name: hottub_online
    resource: "https://mobileapi.lay-z-spa.co.uk/v1/gizwits/is_online"
    headers:
      Content-Type: application/x-www-form-urlencoded
    method: POST
    payload: !secret hottub_api_did
    value_template: "{{ value_json.data }}"
  - platform: rest
    name: hottub_status
    resource: "https://mobileapi.lay-z-spa.co.uk/v1/gizwits/status"
    headers:
      Content-Type: application/x-www-form-urlencoded
    method: POST
    payload: !secret hottub_api_did
    value_template: "{{ value_json.data.attr.power }}"    
    json_attributes_path: "$.data.attr"
    json_attributes:
      - system_err2
      - wave_appm_min
      - heat_timer_min
      - heat_power
      - earth
      - wave_timer_min
      - system_err6
      - system_err7
      - system_err4
      - system_err5
      - heat_temp_reach
      - system_err3
      - system_err1
      - system_err8
      - system_err9
      - filter_timer_min
      - heat_appm_min
      - power
      - temp_set_unit
      - filter_appm_min
      - temp_now
      - wave_power
      - locked
      - filter_power
      - temp_set