Two integration modes.
One protected gateway.

<?php

$endpoint = 'https://clickfrptool.com/login/api/api_sell.php';
$deviceJson = json_encode([
    'productName' => 'XIAOMI GLOBAL',
    'deviceName' => $realDeviceCodename,
    'token' => $tokenReadFromDevice,
], JSON_UNESCAPED_SLASHES);
$payload = json_encode([
    'username' => $customerUsername,
    'password' => $customerPassword,
    'soc' => 'frp',
    'configblob' => base64_encode($deviceJson),
], JSON_UNESCAPED_SLASHES);

$curl = curl_init($endpoint);
curl_setopt_array($curl, [
    CURLOPT_POST => true,
    CURLOPT_RETURNTRANSFER => true,
    CURLOPT_CONNECTTIMEOUT => 15,
    CURLOPT_TIMEOUT => 150,
    CURLOPT_HTTPHEADER => [
        'Content-Type: application/json',
        'Accept: application/json',
    ],
    CURLOPT_POSTFIELDS => $payload,
]);

$response = curl_exec($curl);
$httpCode = curl_getinfo($curl, CURLINFO_RESPONSE_CODE);
curl_close($curl);
$result = json_decode((string) $response, true);
if (!is_array($result) || empty($result['success']) || empty($result['data']['response'])) {
    throw new RuntimeException($result['message'] ?? 'API request failed');
}
$authorization = (string) $result['data']['response'];

using System;
using System.Net.Http;
using System.Net.Http.Headers;
using System.Text;
using System.Threading.Tasks;

public static async Task<string> RequestFdlAsync(
    string credential, string rawFastbootToken, string operationKey)
{
    using (var client = new HttpClient { Timeout = TimeSpan.FromSeconds(150) })
    using (var request = new HttpRequestMessage(HttpMethod.Post,
        "https://clickfrptool.com/login/api/v1/sell.php"))
    {
        request.Headers.Authorization =
            new AuthenticationHeaderValue("Bearer", credential);
        request.Headers.Add("Idempotency-Key", operationKey);
        request.Headers.Accept.Add(
            new MediaTypeWithQualityHeaderValue("application/json"));

        string configblob = Convert.ToBase64String(
            Encoding.UTF8.GetBytes(rawFastbootToken));
        string json = "{\"service\":\"fdl\",\"configblob\":\"" +
            configblob + "\"}";
        request.Content = new StringContent(json, Encoding.UTF8, "application/json");

        using (HttpResponseMessage response = await client.SendAsync(request))
            return await response.Content.ReadAsStringAsync();
    }
}

import base64
import os
import uuid
import requests

endpoint = "https://clickfrptool.com/login/api/v1/sell.php"
credential = os.environ["CLICK_FRP_API_CREDENTIAL"]
operation_key = str(uuid.uuid4())
configblob = base64.b64encode(raw_fastboot_token.encode()).decode()

response = requests.post(
    endpoint,
    headers={
        "Authorization": f"Bearer {credential}",
        "Idempotency-Key": operation_key,
        "Accept": "application/json",
    },
    json={"service": "fdl", "configblob": configblob},
    timeout=(15, 150),
)
result = response.json()