curl --request GET \
  --url https://api.invopop.com/silo/v1/entries/key/{key} \
  --header 'Authorization: Bearer <token>'

import requests

url = "https://api.invopop.com/silo/v1/entries/key/{key}"

headers = {"Authorization": "Bearer <token>"}

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

print(response.text)

const options = {method: 'GET', headers: {Authorization: 'Bearer <token>'}};

fetch('https://api.invopop.com/silo/v1/entries/key/{key}', 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://api.invopop.com/silo/v1/entries/key/{key}",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "GET",
  CURLOPT_HTTPHEADER => [
    "Authorization: Bearer <token>"
  ],
]);

$response = curl_exec($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://api.invopop.com/silo/v1/entries/key/{key}"

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

	req.Header.Add("Authorization", "Bearer <token>")

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

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

	fmt.Println(string(body))

}

HttpResponse<String> response = Unirest.get("https://api.invopop.com/silo/v1/entries/key/{key}")
  .header("Authorization", "Bearer <token>")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.invopop.com/silo/v1/entries/key/{key}")

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

request = Net::HTTP::Get.new(url)
request["Authorization"] = 'Bearer <token>'

response = http.request(request)
puts response.read_body

{
  "attachments": [
    {
      "category": "version",
      "created_at": "2018-01-01T00:00:00.000Z",
      "desc": "Invoice for January 2021.",
      "embeddable": true,
      "entry_id": "347c5b04-cde2-11ed-afa1-0242ac120002",
      "hash": "a1b2c3d4e5f6g7h8i9j0k1l2m3n4o5p6q7r8s9t0u1v2w3x4y5z6",
      "id": "<string>",
      "key": "pdf",
      "meta": {},
      "mime": "application/pdf",
      "name": "invoice.pdf",
      "previous": [
        {
          "created_at": "2018-01-01T00:00:00.000Z",
          "hash": "<string>",
          "id": "<string>",
          "size": 123
        }
      ],
      "private": true,
      "size": 12345,
      "stored": true,
      "url": "<string>"
    }
  ],
  "context": "line.item",
  "created_at": "2018-01-01T00:00:00.000Z",
  "data": {},
  "digest": {
    "alg": "<string>",
    "val": "<string>"
  },
  "doc_schema": "https://gobl.org/draft-0/bill/invoice",
  "draft": true,
  "env_schema": "https://gobl.org/draft-0/envelope",
  "faults": [
    {
      "code": "<string>",
      "message": "<string>",
      "paths": [
        "<string>"
      ],
      "provider": "pdf"
    }
  ],
  "folder": "sales",
  "id": "347c5b04-cde2-11ed-afa1-0242ac120002",
  "invalid": true,
  "key": "invoice-101",
  "meta": [
    {
      "created_at": "2018-01-01T00:00:00.000Z",
      "entry_id": "347c5b04-cde2-11ed-afa1-0242ac120002",
      "id": "347c5b04-cde2-11ed-afa1-0242ac120002:source:key",
      "indexed": true,
      "key": "service-id",
      "link_scope": "public",
      "link_url": "https://example.com/info",
      "owned": true,
      "owner_id": "<string>",
      "ref": "<string>",
      "secure": true,
      "shared": true,
      "src": "source",
      "updated_at": "2018-01-01T00:00:00.000Z",
      "value": {
        "key": "value"
      }
    }
  ],
  "signed": true,
  "snippet": {
    "title": "Sample Title"
  },
  "state": "sent",
  "tags": [
    "<string>"
  ],
  "updated_at": "2018-01-01T00:00:00.000Z",
  "version": "76f845c125",
  "versions": [
    {
      "at": "2018-01-01T00:00:00.000Z",
      "invalid": true,
      "signed": true,
      "src": "api",
      "src_id": "<string>",
      "version": "76f845c125"
    }
  ]
}