curl --request GET \
  --url https://api.openfiskal.com/v1/merchants/{merchantId} \
  --header 'Authorization: Bearer <token>'

{
  "id": "<string>",
  "legal_name": "<string>",
  "country_code": "DEU",
  "address": {
    "line1": "<string>",
    "city": "<string>",
    "postal_code": "<string>",
    "country_code": "DEU",
    "line2": "<string>"
  },
  "fiscal_identities": [
    {
      "country_code": "DEU",
      "tax_number": "21/815/08150",
      "vat_id": "DE123456789"
    }
  ],
  "created_at": "2023-11-07T05:31:56Z",
  "updated_at": "2023-11-07T05:31:56Z"
}