curl --request POST \
  --url https://api.chift.eu/consumers/{consumer_id}/invoicing/upload-document \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '{
  "base64_string": "<string>",
  "document_type": "customer_document"
}'

{
  "id": "<string>",
  "source_ref": {
    "id": "<string>",
    "model": "<string>"
  },
  "currency": "<string>",
  "invoice_type": "customer_invoice",
  "status": "cancelled",
  "invoice_date": "2023-12-25",
  "tax_amount": 123,
  "untaxed_amount": 123,
  "total": 123,
  "lines": [
    {
      "description": "<string>",
      "unit_price": 123,
      "quantity": 123,
      "discount_amount": 0,
      "tax_amount": 123,
      "untaxed_amount": 123,
      "total": 123,
      "tax_rate": 123,
      "account_number": "<string>",
      "tax_id": "<string>",
      "tax_exemption_reason": "<string>",
      "unit_of_measure": "<string>",
      "product_id": "<string>",
      "product_code": "<string>",
      "product_name": "<string>"
    }
  ],
  "partner_id": "<string>",
  "invoice_number": "<string>",
  "due_date": "2023-12-25",
  "reference": "<string>",
  "payment_communication": "<string>",
  "customer_memo": "<string>",
  "journal_ref": {
    "id": "<string>",
    "model": "<string>",
    "name": "<string>"
  },
  "italian_specificities": {
    "stamp_duty_amount": 123,
    "withholding_tax": {
      "rate": 123,
      "amount": 123,
      "reason": "RT01",
      "payment_reason": "A"
    },
    "welfare_fund": {
      "rate": 123,
      "amount": 123,
      "type": "TC01"
    },
    "payment_reporting": {
      "method": "MP01",
      "conditions": "TP01"
    }
  },
  "last_updated_on": "2023-11-07T05:31:56Z",
  "outstanding_amount": 123,
  "last_payment_date": "2023-12-25",
  "accounting_date": "2023-12-25",
  "payment_method_id": "<string>",
  "currency_exchange_rate": 123
}