Peppol

type Invoice {
  // ...all generic invoice fields
  dueDate: string;
  salesOrderRef?: string;
  purchaseOrderRef?: string;
  lines: [
    { 
      // ...other line item fields
      unit: UnitsOfMeasure;
      vat:{
       code: VatCodeUNTDID;
       exemptReason?: string;
      }
    }
  ];
  sender?: {
    // ...other sender fields 
    taxRepresentative?:{
      name:string;
      taxId: string;
      address: {
        country: string;
      }
    }
  };
  recipient:{
    peppolId: {
      endpointId: string;
    };
    taxRepresentative?:{
      name:string;
      taxId: string;
      address: {
        country: string;
      }
    }
  };
  shipToParty?:{
    name: string;
    taxId: string;
    address:{
      line1: string;
      line2: string;
      city: string;
      state: string;
      country: string;
      postalCode: string;
    }
  };
  paymentMeans?: [{
    ref: string;
    code: string;
    account: {
      iban?: string;
      number?: string;
      name: string;
      branch: string;
    };
    card: {
      pan: string;
      network: string;
      holderName: string;
    };
    directDebit: {
      id: string;
      ref: string;
    };
    other: {};
  }];
  attachments?: Attachment[];
  notes?: string;
};

type Attachment {
  name: string;
  contentType: 'application/pdf' | 'image/png' | 'image/jpeg' | 'text/csv' | 
               'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet' |
               'application/vnd.oasis.opendocument.spreadsheet' ;
  data: string;
};