const axios = require('axios');
const FilesApiFp = require('@alohi/faxplus-api').FilesApiFp;
const Configuration = require('@alohi/faxplus-api').Configuration;

const config = new Configuration({
    accessToken: accessToken,
    basePath: 'https://restapi.fax.plus/v3',
    // Header required only when using the OAuth2 token scheme
    baseOptions: {
        headers: {
          "x-fax-clientid": clientId,
        }
    }
});

async function getFile() {
    const reqParams = {
        "userId": '13d8z73c',
        "faxId": '132esd4cs31',
        "format": 'tiff'
    }
    const req = await FilesApiFp(config).getFile(reqParams);
    const resp = await req(axios);
}

getFile()

from faxplus import ApiClient, FilesApi
from faxplus.configuration import Configuration

conf = Configuration()
conf.access_token = access_token
# header_name and header_value required only when using the OAuth2 token scheme
api_client = ApiClient(header_name='x-fax-clientid', header_value=client_id, configuration=conf)
api = FilesApi(api_client)
resp = api.get_file(
    user_id='13d8z73c',
    fax_id='132esd4cs31',
    format='tiff')

/**
 * Example below uses Apache HTTP Client 4 with Fluent API
 **/

Map<String, String> pathParams = new HashMap<>();
pathParams.put("user_id", "'13d8z73c'");
pathParams.put("fax_id", "'132esd4cs31'");

StrSubstitutor sub = new StrSubstitutor(values, "{", "}");
String url = sub.replace("https://restapi.fax.plus/v3/accounts/{user_id}/files/{fax_id}");

String result = Request
    .Get(url)
     // The x-fax-clientid header is required only when using the OAuth2 token scheme
    .addHeader("x-fax-clientid", "YOUR CLIENT_ID")
    .addHeader("Accept", "'application/pdf'")
    .addHeader("Authorization", "'Bearer {access-token}'")
    .execute()
    .returnContent().asString();

System.out.println(result.toString());

package main

import (
       "bytes"
       "net/http"
)

func main() {

    headers := map[string][]string{
        // The x-fax-clientid header is required only when using the OAuth2 token scheme
        "Accept": []string{"application/pdf"},
        "Authorization": []string{"Bearer {access-token}"},
        "x-fax-clientid": []string{"YOUR CLIENT_ID"}
    }

    data := bytes.NewBuffer([]byte{jsonReq})
    req, err := http.NewRequest("GET", "https://restapi.fax.plus/v3/accounts/{user_id}/files/{fax_id}", data)
    req.Header = headers

    client := &http.Client{}
    resp, err := client.Do(req)
    // ...
}

<?php

require 'vendor/autoload.php';

$headers = array(
    'Accept' => 'application/json',
    'Authorization' => 'Bearer {access-token}',
    // The x-fax-clientid header is required only when using the OAuth2 token scheme
    'x-fax-clientid' => '{client ID}',
);

$client = new GuzzleHttp\Client();

try {
    $response = $client->request('GET','https://restapi.fax.plus/v3/accounts/{user_id}/files/{fax_id}', array(
        'headers' => $headers,
        )
    );
    print_r($response->getBody()->getContents());
 }
 catch (GuzzleHttp\Exception\BadResponseException $e) {
    // handle exception or api errors.
    print_r($e->getMessage());
 }

 // ...

# You can also use wget
curl -X GET https://restapi.fax.plus/v3/accounts/{user_id}/files/{fax_id} \
  -H 'Accept: application/pdf'  \
  -H 'Authorization: Bearer {access-token}' \
  # The x-fax-clientid header is required only when using the OAuth2 token scheme
  -H 'x-fax-clientid: "YOUR CLIENT_ID"'