curl --request GET \
  --url https://api.zenskar.com/credit_notes/{credit_note_id} \
  --header 'organisation: <api-key>' \
  --header 'x-api-key: <api-key>'

{
  "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "amount": 123,
  "currency": "<string>",
  "customer_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "line_items_url": "<string>",
  "created_at": "2023-11-07T05:31:56Z",
  "credits_returned": 123,
  "customer": {
    "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "name": "<string>",
    "email": "<string>",
    "external_id": "<string>"
  },
  "invoice": {
    "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "name": "<string>",
    "email": "<string>",
    "external_id": "<string>"
  },
  "invoice_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "custom_data": {},
  "credit_note_number": "<string>"
}