How do I display nested values from an API sensor for Reposit

@mathewryan wrote:

I’m trying to display power consumption and generation values from a power usage system called Reposit (repositpower.com) which I already have installed. I’ve managed to interrogate the iOS app and I have found the API URL. The output is displayed within a browser (following authentication) as:

{
  "data": {
    "battery": {
      "message": null,
      "state": "ONLINE",
      "val": 0.0
    },
    "battery_soc": {
      "val": 0
    },
    "display_scale": {
      "max": 5.139999866485596,
      "min": 0
    },
    "grid": {
      "message": null,
      "state": "ONLINE",
      "val": 0.09839528143469448
    },
    "house": {
      "message": null,
      "state": "ONLINE",
      "val": 4.794253064432299
    },
    "solar": {
      "message": null,
      "state": "ONLINE",
      "val": -4.695857782997605
    }
  }
}

I’m running the latest version of hass.io on my raspberry pi and I have so far put together the following code, based off the description given here (https://www.home-assistant.io/integrations/rest/):

# Reposit
  - platform: rest
    name: reposit
    resource: https://urlforapi
    username: username
    password: password
    authentication: basic
    json_attributes:
      - data
    value_template: 'OK'
    scan_interval: 5
  - platform: template
    sensors:
      reposit_grid:
        value_template: '{{ states.sensor.reposit.attributes["data"]["grid"]["val"] }}'
        device_class: power
        unit_of_measurement: 'kW'
      reposit_house:
        value_template: '{{ states.sensor.reposit.attributes["data"]["house"]["val"] }}'
        device_class: power
        unit_of_measurement: kW
      reposit_solar:
        value_template: '{{ states.sensor.reposit.attributes["data"]["solar"]["val"] }}'
        device_class: power
        unit_of_measurement: 'kW'

I’m guessing that I’ve made a simple mistake but if anyone can nudge me in the right direction, it would be greatly appreciated.

Thanks,
Mat

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