> ## Documentation Index
> Fetch the complete documentation index at: https://docs.flatpeak.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Tariff structure selection

> Customer selects their tariff from a Flatpeak-provided library.

If the customer hasn't logged in to their energy provider or selected a tariff from the library (e.g., if Flatpeak doesn't have it or it's missing), Connect will try to gather the tariff information by asking a series of questions, starting with the tariff structure.

On this page, the customer can choose from three options:

| Option        | Description                                                                                                                                                                                                                                                                                                                   |
| :------------ | :---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| `FIXED`       | Customer will be requested to input their fixed (flat) tariff rate.                                                                                                                                                                                                                                                           |
| `TIME_OF_DAY` | Customer will be requested to input their variable tariff rate.                                                                                                                                                                                                                                                               |
| `MARKET`      | Connect will automatically detect the customer's market rate using their postal address. It will then provide the customer with an option to indicate what fees and/or surcharges they are paying to their provider on top of that rate.                                                                                      |
| `ADVANCED`    | Enables you to build a custom page where your customer can input complex tariff structures — including seasonal rates, special days, consumption tiers, and more. If you plan to use this option, contact support for integration guidance. <Note>This option is currently in preview and not yet generally available.</Note> |

<Tabs>
  <Tab title="Preview">
    <Frame>
      <img src="https://mintcdn.com/flatpeak/eohrMbtRv_VWzSqE/images/06-configure-your-tariff.png?fit=max&auto=format&n=eohrMbtRv_VWzSqE&q=85&s=cde1b6a0e9a5a4a7b6f8693580591fe6" style={{ width: "200px" }} width="1500" height="3408" data-path="images/06-configure-your-tariff.png" />
    </Frame>
  </Tab>

  <Tab title="Code">
    <CodeGroup>
      ```json Connect response theme={"system"}
      {
        "connect_token": "cot_6587fa4362341be5b524de3b",
        "route": "tariff_structure_select",
        "direction": "IMPORT",
        "live_mode": false,
        "data": {
          "provider": {
            "id": "prv_65de304bba73636872c17c11",
            "display_name": "E-ON",
            "logo_url": "https://s.flatpeak.com/73636872c17c11.png"
          },
          "options": [
            "FIXED",
            "TIME_OF_DAY",
            "MARKET",
            "ADVANCED"
          ]
        }
      }
      ```

      ```json Your POST to Connect theme={"system"}
      curl --request POST \
        --url https://connect.flatpeak.com \
        --header 'Content-Type: application/json' \
        --data '{
        "connect_token": "cot_6587fa4362341be5b524de3b",
        "route": "tariff_structure_select",
        "data": {
          "options": [
            "MARKET"
          ]
        }
      }'
      ```
    </CodeGroup>

    When you POST the response, Connect may return any of these [validation errors](/guides/system/errors):

    | Error Code             | Error Description                            |
    | ---------------------- | -------------------------------------------- |
    | `option_invalid`       | The options array can only contain one item. |
    | `option_not_supported` | Unsupported option parameter XX.             |
    | `data_json_invalid`    | Data does not conform to the JSON schema.    |
  </Tab>
</Tabs>