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GET
/
v1
/
users
/
{user_id}
Get third-party user details
curl --request GET \
  --url https://register.tariff.interop/v1/users/{user_id} \
  --header 'X-Supplier-API-Key: <api-key>'
import requests

url = "https://register.tariff.interop/v1/users/{user_id}"

headers = {"X-Supplier-API-Key": "<api-key>"}

response = requests.get(url, headers=headers)

print(response.text)
const options = {method: 'GET', headers: {'X-Supplier-API-Key': '<api-key>'}};

fetch('https://register.tariff.interop/v1/users/{user_id}', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));
<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://register.tariff.interop/v1/users/{user_id}",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "GET",
  CURLOPT_HTTPHEADER => [
    "X-Supplier-API-Key: <api-key>"
  ],
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}
package main

import (
	"fmt"
	"net/http"
	"io"
)

func main() {

	url := "https://register.tariff.interop/v1/users/{user_id}"

	req, _ := http.NewRequest("GET", url, nil)

	req.Header.Add("X-Supplier-API-Key", "<api-key>")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(string(body))

}
HttpResponse<String> response = Unirest.get("https://register.tariff.interop/v1/users/{user_id}")
  .header("X-Supplier-API-Key", "<api-key>")
  .asString();
require 'uri'
require 'net/http'

url = URI("https://register.tariff.interop/v1/users/{user_id}")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Get.new(url)
request["X-Supplier-API-Key"] = '<api-key>'

response = http.request(request)
puts response.read_body
{
  "user_id": "usr_c7e2f1a03b4d4e5f8a9b1c2d3e4f5a6b",
  "name": "Example Optimiser Ltd",
  "display_name": "Optimiser",
  "status": "active",
  "last_modified": "2026-10-15T08:30:00.000Z",
  "support": "tariff-support@optimiser.co.uk"
}
{
  "code": "tariff_not_found",
  "message": "No tariff found for the given tariff_id and supplier MPID.",
  "details": "tariff_id a1b2c3d4-e5f6-7890-abcd-ef1234567890 does not exist for supplier SEBD."
}
{
  "code": "tariff_not_found",
  "message": "No tariff found for the given tariff_id and supplier MPID.",
  "details": "tariff_id a1b2c3d4-e5f6-7890-abcd-ef1234567890 does not exist for supplier SEBD."
}
{
  "code": "tariff_not_found",
  "message": "No tariff found for the given tariff_id and supplier MPID.",
  "details": "tariff_id a1b2c3d4-e5f6-7890-abcd-ef1234567890 does not exist for supplier SEBD."
}

Authorizations

​
X-Supplier-API-Key
string
header
required

API key issued to TI Energy Suppliers for accessing restricted register data and submitting performance reports. Credentials are valid for 2 years and are distributed via a one-time URL from the Code Manager.

Path Parameters

​
user_id
string<uuid>
required

The user_id of the RTI User, as returned by GET /v1/users. Compact UUID generated by RECCo uniquely identifying the user with usr_.

Pattern: ^usr_[0-9a-f]{32}$
Example:

"usr_550e8400e29b41d4a716446655440000"

Response

A single RTI User register entry.

An RTI User's entry in the TI User Register. Registration data (webhook URL, contact details) is only returned to authenticated suppliers.

​
user_id
string<uuid>
required

Compact UUID generated by RECCo uniquely identifying the user with usr_.

Pattern: ^usr_[0-9a-f]{32}$
Example:

"usr_550e8400e29b41d4a716446655440000"

​
name
string
required

Organisation's legal name.

Maximum string length: 200
Example:

"Cucumber Energy Optimiser Ltd"

​
display_name
string
required

Short trading name displayed to consumers.

Maximum string length: 100
Example:

"Optimiser"

​
status
enum<string>
required

The status of the user.

Available options:
active,
suspended,
disabled,
removed
Example:

"active"

​
support
string
required

Support contact information for Users - email, url, telephone is acceptable.

Example:

"tariff-support@optimiser.co.uk"

​
last_modified
string<date-time>
required

ISO 8601 datetime with millisecond precision.

Example:

"2026-11-01T10:00:00.000Z"

Last modified on March 28, 2026