Overview

The Bill format is a business-driven format designed to encapsulate bill data with payment instructions. It can handle both single bills and bulk bill processing, using a proprietary XML format specific to the FarPay system.

Bill Format Requirements

Prerequisites

X-API-KEY: Merchant API key from FarPay settings page
XSD Schema: Available at https://app.farpay.io/xsd/bills/bills.xsd
Base64 Encoding: Bill files must be base64 encoded

Creating Bill Deliveries

Step-by-Step Process

Get the XSD document and create a bill file
Encode the PDF document into base64 format
Put the base64 string into the EncodedDocument container
Convert the entire XML document into base64 string
Create a Delivery with the following data:
- DeliveryType = Bill
- DeliveryFormat = XML
- File containing the base64 encoded bill

Basic Bill Example

<?xml version="1.0" encoding="UTF-8"?>
<FarPayXml xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
           xsi:schemaLocation="http://app.farpay.io/xsd/bills.xsd">
    <Delivery>
        <Count>1</Count>
    </Delivery>
    <Bills>
        <Bill>
            <InvoiceTypeCode>PCM</InvoiceTypeCode>
            <InvoiceNumber>CRED-12345</InvoiceNumber>
            <EncodedDocument>JVBERi0xLjcNCiW1t......olJUVPRg==</EncodedDocument>
            <CustomerNumber>CUST-67890</CustomerNumber>
            <Name>John Doe</Name>
            <Street>Main Street</Street>
            <HouseNumber>42</HouseNumber>
            <PostalZone>12345</PostalZone>
            <CityName>Example City</CityName>
            <Country>CountryName</Country>
            <EmailAddress>johndoe@example.com</EmailAddress>
            <PaymentDueDate>2025-02-01</PaymentDueDate>
            <Currency>DKK</Currency>
            <ToBePayedAmount>123.45</ToBePayedAmount>
        </Bill>
    </Bills>
</FarPayXml>

API Request

POST https://api.farpay.io/v2/deliveries

Request Body:

{
  "DeliveryType": "Bill",
  "DeliveryFormat": "XML",
  "File": {
    "Filename": "MyFile.xml",
    "Data": "PD94bWwgdmVyc2lvbj0iMS4wIiBlbm......+DQo8L0ZhclBheVhtbD4="
  }
}

Overførselsservice (OS) Bills

Overførselsservice bills are used for payout scenarios where you need to send money to customers or partners.

OS Bill Example

<?xml version="1.0" encoding="UTF-8"?>
<FarPayXml xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
           xsi:schemaLocation="http://app.farpay.io/xsd/bills.xsd">
    <Delivery>
        <Count>1</Count>
    </Delivery>
    <Bills>
        <Bill>
            <InvoiceTypeCode>PCM</InvoiceTypeCode>
            <InvoiceNumber>INV-12345</InvoiceNumber>
            <EncodedDocument>JVBERi0xLjcNCiW1t......olJUVPRg==</EncodedDocument>
            <CustomerNumber>CUST-67890</CustomerNumber>
            <Name>John Doe</Name>
            <Street>Main Street</Street>
            <HouseNumber>42</HouseNumber>
            <PostalZone>12345</PostalZone>
            <CityName>Example City</CityName>
            <Country>CountryName</Country>
            <EmailAddress>johndoe@example.com</EmailAddress>
            <PaymentDueDate>2025-02-01</PaymentDueDate>
            <Currency>DKK</Currency>
            <ToBePayedAmount>123.45</ToBePayedAmount>
            <PaymentMeans>
                <TypeCodeID>BankTransfer</TypeCodeID>
                <PaymentChannelCode>OVERFØRSELSSERVICE</PaymentChannelCode>
                <ExtensibleContent>
                    <FarPay>
                        <PaymentMethod>Payout</PaymentMethod>
                        <Payout>
                            <SenderIdentifier scheme="BANK">rrrr:nnnnnnnn</SenderIdentifier>
                            <ReceiverIdentifier scheme="BANK">rrrr:nnnnnnnn</ReceiverIdentifier>
                        </Payout>                         
                    </FarPay>
                </ExtensibleContent>
            </PaymentMeans>
        </Bill>
    </Bills>
</FarPayXml>

Payout Identifier Schemes

Scheme	Description	Format	Example
`BANK`	Bank account details	`rrrr:aaaaaaaa`	`1234:12345678`
`CVR`	Company registration number	8 digits	`12345678`
`CPR`	Personal identification number	10 digits	`0102889999`

Payout Details

SenderIdentifier: Optional - specify if you have multiple Overførselsservice creditors
ReceiverIdentifier: Required - specifies where to send the money
Scheme: Determines the format of the identifier

Bill Properties

Core Bill Properties

Property	Type	Description	Required
`InvoiceTypeCode`	string	Invoice type code	Yes
`InvoiceNumber`	string	Unique invoice number	Yes
`EncodedDocument`	string	Base64 encoded PDF document	Yes
`CustomerNumber`	string	Customer reference number	Yes
`Name`	string	Customer name	Yes
`Street`	string	Street address	Yes
`HouseNumber`	string	House/building number	Yes
`PostalZone`	string	Postal code	Yes
`CityName`	string	City name	Yes
`Country`	string	Country name	Yes
`EmailAddress`	string	Customer email	Yes
`PaymentDueDate`	date	Payment due date (YYYY-MM-DD)	Yes
`Currency`	string	Currency code	Yes
`ToBePayedAmount`	decimal	Amount to be paid	Yes

Payment Means Properties (OS Bills)

Property	Type	Description
`TypeCodeID`	string	Payment type (BankTransfer)
`PaymentChannelCode`	string	Payment channel (OVERFØRSELSSERVICE)
`PaymentMethod`	string	Method (Payout)
`SenderIdentifier`	object	Sender bank details
`ReceiverIdentifier`	object	Receiver identification

File Upload Process

Two-Step Upload for Large Files

For large bill files, use the two-step upload process:

Step 1: Create Delivery

{
  "DeliveryType": "Bill",
  "DeliveryFormat": "XML",
  "File": {
    "Filename": "large_bills.xml"
  }
}

Step 2: Upload File

PUT {FileUploadUri}

Required Headers:

x-ms-blob-type: blockblob
Content-Type: application/octet-stream

Implementation Examples

JavaScript Example

// Convert PDF to base64
const fs = require('fs');
const pdfContent = fs.readFileSync('invoice.pdf');
const base64Pdf = pdfContent.toString('base64');

// Create bill XML
const billXml = `<?xml version="1.0" encoding="UTF-8"?>
<FarPayXml xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
           xsi:schemaLocation="http://app.farpay.io/xsd/bills.xsd">
    <Delivery>
        <Count>1</Count>
    </Delivery>
    <Bills>
        <Bill>
            <InvoiceTypeCode>PCM</InvoiceTypeCode>
            <InvoiceNumber>INV-${Date.now()}</InvoiceNumber>
            <EncodedDocument>${base64Pdf}</EncodedDocument>
            <CustomerNumber>CUST-67890</CustomerNumber>
            <Name>John Doe</Name>
            <Street>Main Street</Street>
            <HouseNumber>42</HouseNumber>
            <PostalZone>12345</PostalZone>
            <CityName>Example City</CityName>
            <Country>Denmark</Country>
            <EmailAddress>johndoe@example.com</EmailAddress>
            <PaymentDueDate>2025-02-01</PaymentDueDate>
            <Currency>DKK</Currency>
            <ToBePayedAmount>123.45</ToBePayedAmount>
        </Bill>
    </Bills>
</FarPayXml>`;

// Convert XML to base64
const base64Xml = Buffer.from(billXml).toString('base64');

// Create delivery
const delivery = {
  DeliveryType: "Bill",
  DeliveryFormat: "XML",
  File: {
    Filename: "bills.xml",
    Data: base64Xml
  }
};

const response = await fetch('https://api.farpay.io/v2/deliveries', {
  method: 'POST',
  headers: {
    'X-API-KEY': 'your-api-key',
    'Content-Type': 'application/json'
  },
  body: JSON.stringify(delivery)
});

Python Example

import base64
import requests

# Read PDF file
with open('invoice.pdf', 'rb') as pdf_file:
    pdf_content = pdf_file.read()
    base64_pdf = base64.b64encode(pdf_content).decode('utf-8')

# Create bill XML
bill_xml = f'''<?xml version="1.0" encoding="UTF-8"?>
<FarPayXml xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
           xsi:schemaLocation="http://app.farpay.io/xsd/bills.xsd">
    <Delivery>
        <Count>1</Count>
    </Delivery>
    <Bills>
        <Bill>
            <InvoiceTypeCode>PCM</InvoiceTypeCode>
            <InvoiceNumber>INV-12345</InvoiceNumber>
            <EncodedDocument>{base64_pdf}</EncodedDocument>
            <CustomerNumber>CUST-67890</CustomerNumber>
            <Name>John Doe</Name>
            <Street>Main Street</Street>
            <HouseNumber>42</HouseNumber>
            <PostalZone>12345</PostalZone>
            <CityName>Example City</CityName>
            <Country>Denmark</Country>
            <EmailAddress>johndoe@example.com</EmailAddress>
            <PaymentDueDate>2025-02-01</PaymentDueDate>
            <Currency>DKK</Currency>
            <ToBePayedAmount>123.45</ToBePayedAmount>
        </Bill>
    </Bills>
</FarPayXml>'''

# Convert XML to base64
base64_xml = base64.b64encode(bill_xml.encode('utf-8')).decode('utf-8')

# Create delivery
delivery = {
    "DeliveryType": "Bill",
    "DeliveryFormat": "XML",
    "File": {
        "Filename": "bills.xml",
        "Data": base64_xml
    }
}

response = requests.post(
    'https://api.farpay.io/v2/deliveries',
    headers={
        'X-API-KEY': 'your-api-key',
        'Content-Type': 'application/json'
    },
    json=delivery
)

Error Handling

Common Error Responses

Status Code	Description
`400`	Bad request - Invalid bill format
`401`	Unauthorized - Invalid API key
`404`	Not found - Delivery doesn't exist

Common Bill Errors

Error	Description	Solution
`Invalid XML structure`	Malformed XML content	Validate against XSD schema
`Missing required fields`	Required data missing	Check all required properties
`Invalid base64 encoding`	PDF not properly encoded	Ensure proper base64 encoding
`File too large`	Bill file exceeds limits	Use two-step upload process

Best Practices

Validate XML structure - Use the XSD schema for validation
Proper base64 encoding - Ensure PDF documents are correctly encoded
Unique invoice numbers - Use unique identifiers for each bill
Handle large files - Use two-step upload for files > 10MB
Monitor processing - Check delivery status after upload
Test thoroughly - Test with small files before production

Related Endpoints

Deliveries - General delivery management
Invoices - Invoice creation and management
Payments - Payment tracking and processing