curl --request GET \
  --url https://merchant.zahlo.eu/api/v1/invoices/{id} \
  --header 'x-api-key: <api-key>'

import requests

url = "https://merchant.zahlo.eu/api/v1/invoices/{id}"

headers = {"x-api-key": "<api-key>"}

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

print(response.text)

const options = {method: 'GET', headers: {'x-api-key': '<api-key>'}};

fetch('https://merchant.zahlo.eu/api/v1/invoices/{id}', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

{
  "id": "inv_demo_1001",
  "customerId": "cus_demo_1001",
  "status": "open",
  "amountDue": {
    "amountMinor": 1900,
    "currency": "EUR"
  }
}

{
  "error": "invalid_request",
  "message": "amountMinor must be positive",
  "requestId": "req_demo_1001"
}

{
  "error": "invalid_request",
  "message": "amountMinor must be positive",
  "requestId": "req_demo_1001"
}

{
  "error": "invalid_request",
  "message": "amountMinor must be positive",
  "requestId": "req_demo_1001"
}

{
  "error": "invalid_request",
  "message": "amountMinor must be positive",
  "requestId": "req_demo_1001"
}