curl --get "${BASE_URL}/api/v2/plan/list" \
  -H "Authorization: Bearer ${ACCESS_TOKEN}" \
  -H "Accept: application/json" \
  --data-urlencode merchant_id=48290713 \
  --data-urlencode page=1 \
  --data-urlencode page_size=20

import json
import os
import urllib.parse
import urllib.request

base_url = os.environ["BASE_URL"].rstrip("/")
url = base_url + "/api/v2/plan/list"
headers = {"Accept": "application/json"}
headers["Authorization"] = "Bearer " + os.environ["ACCESS_TOKEN"]
params = {
    "merchant_id": "48290713",
    "page": "1",
    "page_size": "20",
}
url += "?" + urllib.parse.urlencode(params)
body = None

request = urllib.request.Request(url, data=body, headers=headers, method="GET")
with urllib.request.urlopen(request, timeout=30) as response:
    print(response.read().decode("utf-8"))

const env = (name) => {
  const value = process.env[name];
  if (!value) throw new Error(`Missing environment variable: ${name}`);
  return value;
};
const baseUrl = env("BASE_URL").replace(/\/+$/, "");
const url = new URL(baseUrl + "/api/v2/plan/list");
const headers = { Accept: "application/json" };
headers.Authorization = `Bearer ${env("ACCESS_TOKEN")}`;
const params = new URLSearchParams({
  "merchant_id": "48290713",
  "page": "1",
  "page_size": "20",
});
url.search = params.toString();

const response = await fetch(url, {
  method: "GET",
  headers,
  signal: AbortSignal.timeout(30_000),
});
console.log(await response.text());

<?php
$env = static function (string $name): string {
    $value = getenv($name);
    if ($value === false || $value === '') {
        throw new RuntimeException("Missing environment variable: " . $name);
    }
    return $value;
};
$baseUrl = rtrim($env('BASE_URL'), '/');
$url = $baseUrl . "/api/v2/plan/list";
$headers = ['Accept: application/json'];
$headers[] = 'Authorization: Bearer ' . $env('ACCESS_TOKEN');
$params = [
    "merchant_id" => "48290713",
    "page" => "1",
    "page_size" => "20",
];
$url .= '?' . http_build_query($params, '', '&', PHP_QUERY_RFC3986);

$curl = curl_init($url);
curl_setopt_array($curl, [
    CURLOPT_CUSTOMREQUEST => "GET",
    CURLOPT_HTTPHEADER => $headers,
    CURLOPT_RETURNTRANSFER => true,
    CURLOPT_TIMEOUT => 30,
]);
$response = curl_exec($curl);
if ($response === false) {
    $error = curl_error($curl);
    curl_close($curl);
    throw new RuntimeException($error);
}
curl_close($curl);
echo $response, PHP_EOL;

package main

import (
    "fmt"
    "io"
    "net/http"
    "net/url"
    "os"
    "strings"
    "time"
)

func mustEnv(name string) string {
    value := os.Getenv(name)
    if value == "" { panic("Missing environment variable: " + name) }
    return value
}

func main() {
    baseURL := strings.TrimRight(mustEnv("BASE_URL"), "/")
    endpoint := baseURL + "/api/v2/plan/list"
    params := url.Values{}
    params.Set("merchant_id", "48290713")
    params.Set("page", "1")
    params.Set("page_size", "20")
    endpoint += "?" + params.Encode()
    req, err := http.NewRequest("GET", endpoint, nil)
    if err != nil { panic(err) }
    req.Header.Set("Accept", "application/json")
    req.Header.Set("Authorization", "Bearer " + mustEnv("ACCESS_TOKEN"))
    client := &http.Client{Timeout: 30 * time.Second}
    response, err := client.Do(req)
    if err != nil { panic(err) }
    defer response.Body.Close()
    result, err := io.ReadAll(response.Body)
    if err != nil { panic(err) }
    fmt.Println(string(result))
}

import java.io.ByteArrayOutputStream;
import java.net.URI;
import java.net.URLEncoder;
import java.net.http.HttpClient;
import java.net.http.HttpRequest;
import java.net.http.HttpResponse;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.nio.file.Path;
import java.time.Duration;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.UUID;
import java.util.stream.Collectors;

public class Example {
    static String requireEnv(String name) {
        String value = System.getenv(name);
        if (value == null || value.isEmpty()) {
            throw new IllegalArgumentException("Missing environment variable: " + name);
        }
        return value;
    }

    public static void main(String[] args) throws Exception {
        String baseUrl = requireEnv("BASE_URL").replaceAll("/+$", "");
        String endpoint = baseUrl + "/api/v2/plan/list";
        Map<String, String> params = new LinkedHashMap<>();
        params.put("merchant_id", "48290713");
        params.put("page", "1");
        params.put("page_size", "20");
        String encoded = params.entrySet().stream()
            .map(e -> URLEncoder.encode(e.getKey(), StandardCharsets.UTF_8) + "="
                + URLEncoder.encode(e.getValue(), StandardCharsets.UTF_8))
            .collect(Collectors.joining("&"));
        endpoint += "?" + encoded;
        HttpRequest.Builder builder = HttpRequest.newBuilder(URI.create(endpoint))
            .timeout(Duration.ofSeconds(30))
            .header("Accept", "application/json");
        builder.header("Authorization", "Bearer " + requireEnv("ACCESS_TOKEN"));
        HttpRequest request = builder.method("GET", HttpRequest.BodyPublishers.noBody()).build();
        HttpClient client = HttpClient.newBuilder().connectTimeout(Duration.ofSeconds(30)).build();
        HttpResponse<String> response = client.send(request,
            HttpResponse.BodyHandlers.ofString(StandardCharsets.UTF_8));
        System.out.println(response.body());
    }
}

require "net/http"
require "uri"

base_url = ENV.fetch("BASE_URL").sub(%r{/+$}, "")
uri = URI(base_url + "/api/v2/plan/list")
params = {
  "merchant_id" => "48290713",
  "page" => "1",
  "page_size" => "20",
}
uri.query = URI.encode_www_form(params)
request = Net::HTTP::Get.new(uri)
request["Accept"] = "application/json"
request["Authorization"] = "Bearer " + ENV.fetch("ACCESS_TOKEN")
http = Net::HTTP.new(uri.host, uri.port)
http.use_ssl = uri.scheme == "https"
http.open_timeout = 30
http.read_timeout = 30
puts http.request(request).body