curl --request POST \
  --url https://api.maesn.dev/accounting/bookingProposals \
  --header 'Content-Type: multipart/form-data' \
  --header 'X-ACCOUNT-KEY: <x-account-key>' \
  --header 'X-API-KEY: <x-api-key>' \
  --form bookingType=INVOICE \
  --form 'bookingProposal={
  "id": "BP-12345",
  "addresses ": [
    {
      "city": "city"
    }
  ],
  "bankAccountId": "5a6b7f5dw45c1c-403e-ad56-202fbc312414",
  "bankAccountNumber": 5407324931,
  "bankCode": "50010517",
  "bic": "DEUTDEFF",
  "bookingProposalDate": "2025-07-14T00:00:00Z",
  "contactAccountNumber": 70000,
  "contactId": "eaa28f49-6028-4b6e-bb12-d8f6278073fc",
  "contactName ": "John Doe",
  "currency": "EUR",
  "deliveryDate": "2025-07-26T00:00:00Z",
  "discountPaymentDate": "2025-07-16T00:00:00Z",
  "discountPaymentDate2": "2025-07-18T00:00:00Z",
  "dueDate": "2025-07-24T00:00:00Z",
  "journalCode": "60",
  "iban": "DE43100500000920018963",
  "isPaymentOrder": "true",
  "ledgerName": "Payroll",
  "lineItems": [
    {
      "id": "Item-112233",
      "accountCode": "200",
      "accountId": "db32-4f56-8a9b-1234567890ab",
      "accountName": "EXPENSE",
      "accountNumber": 4900,
      "bookingTaxCode": "9",
      "description": "Item A",
      "dimension1": "Marketing",
      "dimension2": "Service and Maintenance",
      "discountAmount": 100,
      "discountAmount2": 50,
      "discountPercentage": 20,
      "discountPercentage2": 10,
      "taxCode": "02",
      "taxRatePercentage": 19,
      "totalGrossAmount": 500,
      "totalNetAmount": 450
    }
  ],
  "notes": "Bill for maintenance services",
  "number": "1233330",
  "orderId": "3344566",
  "paidDate": "2021-01-01T00:00:00Z",
  "paymentTermsId": "03",
  "totalGrossAmount": 500,
  "vatId": "DE987654321"
}'

{
  "meta": {
    "warnings": [
      "Field not used by target system"
    ],
    "pagination": {
      "total": 123,
      "perPage": 123,
      "currentPage": 123,
      "totalPages": 123
    }
  },
  "data": {
    "id": "BP-12345",
    "addresses ": [
      {
        "city": "city"
      }
    ],
    "bankAccountId": "5a6b7f5dw45c1c-403e-ad56-202fbc312414",
    "bankAccountNumber": 5407324931,
    "bankCode": "50010517",
    "bic": "DEUTDEFF",
    "bookingProposalDate": "2025-07-14T00:00:00Z",
    "bookingType": "INVOICE",
    "contactAccountNumber": 70000,
    "contactId": "eaa28f49-6028-4b6e-bb12-d8f6278073fc",
    "contactName ": "John Doe",
    "createdDate": "2025-07-16T00:00:00Z",
    "currency": "EUR",
    "deliveryDate": "2025-07-26T00:00:00Z",
    "discountPaymentDate": "2025-07-16T00:00:00Z",
    "discountPaymentDate2": "2025-07-18T00:00:00Z",
    "dueDate": "2025-07-24T00:00:00Z",
    "files": [
      "file1.pdf"
    ],
    "journalCode": "60",
    "iban": "DE43100500000920018963",
    "isPaymentOrder": "true",
    "ledgerName": "Payroll",
    "lineItems": [
      {
        "id": "Item-112233",
        "accountCode": "200",
        "accountId": "db32-4f56-8a9b-1234567890ab",
        "accountName": "EXPENSE",
        "accountNumber": 4900,
        "bookingTaxCode": "9",
        "createdDate": "2021-01-01T00:00:00Z",
        "description": "Item A",
        "dimension1": "Marketing",
        "dimension2": "Service and Maintenance",
        "discountAmount": 100,
        "discountAmount2": 50,
        "discountPercentage": 20,
        "discountPercentage2": 10,
        "taxCode": "02",
        "taxRatePercentage": 19,
        "totalGrossAmount": 500,
        "totalNetAmount": 450,
        "updatedDate": "2021-01-01T00:00:00Z"
      }
    ],
    "notes": "Bill for maintenance services",
    "number": "1233330",
    "orderId": "3344566",
    "paidDate": "2021-01-01T00:00:00Z",
    "paymentTermsId": "03",
    "taskId": "ADHUR74BCBSW8399DCN",
    "totalGrossAmount": 500,
    "updatedDate": "2025-07-16T00:00:00Z",
    "vatId": "DE987654321"
  }
}