curl --request GET \
  --url https://api.tilta.io/v1/invoices/{external_id} \
  --header 'Authorization: Bearer <token>'

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

fetch('https://api.tilta.io/v1/invoices/{external_id}', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

import requests

url = "https://api.tilta.io/v1/invoices/{external_id}"

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

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

print(response.text)

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://api.tilta.io/v1/invoices/{external_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 => [
    "Authorization: Bearer <token>"
  ],
]);

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

curl_close($curl);

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

{
  "external_id": "<string>",
  "buyer_external_id": "<string>",
  "merchant_external_id": "<string>",
  "created_at": 1582896122,
  "updated_at": 1582896122,
  "due_at": 1582896122,
  "status": "OPEN",
  "days_past_due": 123,
  "payment_method": "CASH",
  "invoice_number": "<string>",
  "invoiced_at": 1582896122,
  "amount": {
    "net": 2,
    "gross": 2,
    "currency": "EUR",
    "tax": 1
  },
  "contact": {
    "external_id": "<string>",
    "buyer_external_id": "<string>",
    "assign_to_all_invoices": true,
    "created_at": 1582896122,
    "updated_at": 1582896122,
    "salutation": "MR",
    "first_name": "<string>",
    "last_name": "<string>",
    "email": "jsmith@example.com",
    "phone": "+491711010101",
    "address": {
      "postcode": "12345",
      "city": "Berlin",
      "country": "AF",
      "street": "Example Street",
      "house": "42b",
      "additional": "c/o Testimonial"
    }
  },
  "paid_at": 123,
  "buyer": {
    "legal_name": "<string>"
  },
  "services": [
    {
      "external_id": "<string>",
      "invoice_external_id": "<string>",
      "service_type": "FINANCING",
      "status": "IN_REVIEW",
      "created_at": 123,
      "updated_at": 123,
      "requirements": [
        {
          "code": "INVOICE_INELIGIBLE",
          "description": "<string>"
        }
      ],
      "advance": {
        "value": 123
      },
      "fee": {
        "gross": 123,
        "net": 123,
        "tax": 123
      }
    }
  ],
  "credit_note_summary": {
    "count": 2,
    "amount": {
      "gross": 1000,
      "net": 800,
      "tax": 200,
      "currency": "EUR"
    },
    "original_invoice_amount": {
      "gross": 5000,
      "net": 4000,
      "tax": 1000,
      "currency": "EUR"
    },
    "has_active_mandate": true,
    "financing_status": "IN_REVIEW"
  },
  "order_external_ids": [],
  "line_items": [
    {
      "name": "<string>",
      "category": "<string>",
      "price": 123,
      "currency": "EUR",
      "quantity": 2,
      "description": "<string>"
    }
  ],
  "billing_address": {
    "postcode": "12345",
    "city": "Berlin",
    "country": "AF",
    "street": "Example Street",
    "house": "42b",
    "additional": "c/o Testimonial"
  },
  "delivery_address": {
    "postcode": "12345",
    "city": "Berlin",
    "country": "AF",
    "street": "Example Street",
    "house": "42b",
    "additional": "c/o Testimonial"
  },
  "custom_data": {}
}

{
  "code": "BAD_REQUEST",
  "error": "Request validation failed. 1 issue found.",
  "issues": [
    {
      "code": "INVALID_TYPE",
      "path": "body.registered_at",
      "message": "Invalid type"
    }
  ]
}

{
  "error": "Unauthorized",
  "code": "UNAUTHORIZED"
}

{
  "error": "No Entity found",
  "code": "NOT_FOUND"
}