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Resources

Knowledge for a better decision.

Practical Guides, news, customer experience and security facts for decisions about invoicing, fiscalization, POS and eCommerce.

Resources

Knowledge for a better decision.

Practical Guides, news, customer experience and security facts for decisions about invoicing, fiscalization, POS and eCommerce.

Resources

Knowledge for a better decision.

Practical guides, news, user experiences and security facts for accounts, fiscalisation, POS and eCommerce decisions.

Explore BillKO from four angles.

Explore BillKO from four angles.

Explore BillKO from four angles.

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Billing and invoicing

A sale is only complete when payment and invoicing are settled. BillKO connects these steps to reduce manual data entry and provide a clearer status for every sale.

Blog

BillKO news, partnerships and product development.

Open resource

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Billing and invoicing

A sale is only complete when payment and invoicing are settled. BillKO connects these steps to reduce manual data entry and provide a clearer status for every sale.

Blog

BillKO news, partnerships and product development.

Open resource

<p dir="auto"><br class="trailing-break"></p>

Billing and invoicing

A sale is only complete when payment and invoicing are settled. BillKO connects these steps to reduce manual data entry and provide a clearer status for every sale.

Blog

BillKO news, partnerships and product development.

Open resource

Answers for the decisions you need to make.

Answers for the decisions you need to make.

Answers for the decisions you need to make.

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POS and mobile fiscal cash register

Compare a POS terminal, a fiscal cash register, and a mobile Android app for card payments, fiscalization, and receipt printing.

eInvoices and fiscalization

A clear guide to Fiscalization 1.0 and 2.0, e-invoices, obligations in 2026 and 2027, non-VAT taxpayers, and invoices for the EU and exports.

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POS and mobile fiscal cash register

Compare a POS terminal, a fiscal cash register, and a mobile Android app for card payments, fiscalization, and receipt printing.

eInvoices and fiscalization

A clear guide to Fiscalization 1.0 and 2.0, e-invoices, obligations in 2026 and 2027, non-VAT taxpayers, and invoices for the EU and exports.

<p dir="auto"><br class="trailing-break"></p>

POS and mobile fiscal cash register

Compare a POS terminal, a fiscal cash register, and a mobile Android app for card payments, fiscalization, and receipt printing.

eInvoices and fiscalization

A clear guide to Fiscalization 1.0 and 2.0, e-invoices, obligations in 2026 and 2027, non-VAT taxpayers, and invoices for the EU and exports.

From BillKO.

From BillKO.

From BillKO.

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Product development

Small business shouldn't have to organize its day around invoicing software. The software should adapt to the way the business sells, collects payments, and collaborates with its accountant.

<p dir="auto"><br class="trailing-break"></p>

Billing and invoicing

A sale is only complete when payment and invoicing are settled. BillKO connects these steps to reduce manual data entry and provide a clearer status for every sale.

<p dir="auto"><br class="trailing-break"></p>

Product development

Small business shouldn't have to organize its day around invoicing software. The software should adapt to the way the business sells, collects payments, and collaborates with its accountant.

<p dir="auto"><br class="trailing-break"></p>

Billing and invoicing

A sale is only complete when payment and invoicing are settled. BillKO connects these steps to reduce manual data entry and provide a clearer status for every sale.

<p dir="auto"><br class="trailing-break"></p>

Product development

Small business shouldn't have to organize its day around invoicing software. The software should adapt to the way the business sells, collects payments, and collaborates with its accountant.

<p dir="auto"><br class="trailing-break"></p>

Billing and invoicing

A sale is only complete when payment and invoicing are settled. BillKO connects these steps to reduce manual data entry and provide a clearer status for every sale.

Experience from real work.

Experience from real work.

Experience from real work.

Short quotations and stories show how BillKO works for invoicing, POS, eCommerce and accountants.

Review the security facts.

Review the security facts.

Review the security facts.

CERTIFIED SYSTEM

ISO/IEC 27001

Information security management

Partners and integrations

Payment, POS, eCommerce and specialist partners connect BillKO with the way you do business.

SIQ • CERTIFICATE

Certificate for management system

KUPUJ ONLINE d.o.o.

Fiorella La Guardie 13, 51000 Rijeka, Croatia

Development, delivery and maintenance of digital products

Information Security Records, Declaration of Applicability (SoA) 2025, version 1.0 of October 28, 2025

appropriately applies and maintains a management system that meets the requirements of the standard

ISO/IEC 27001:2022

Certificate number

I-0192

Date of certification

2025-10-30

Edition

01 / 2025.10-30

Valid until:

2028-10-30

SIQ Ljubljana · Mašera-Spasićeva street 10, 1000 Ljubljana, Slovenia

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CERTIFIED SYSTEM

ISO/IEC 27001

Information security management

Partners and integrations

Payment, POS, eCommerce and specialist partners connect BillKO with the way you do business.

SIQ • CERTIFICATE

Certificate for management system

KUPUJ ONLINE d.o.o.

Fiorella La Guardie 13, 51000 Rijeka, Croatia

Development, delivery and maintenance of digital products

Information Security Records, Declaration of Applicability (SoA) 2025, version 1.0 of October 28, 2025

appropriately applies and maintains a management system that meets the requirements of the standard

ISO/IEC 27001:2022

Certificate number

I-0192

Date of certification

2025-10-30

Edition

01 / 2025.10-30

Valid until:

2028-10-30

SIQ Ljubljana · Mašera-Spasićeva street 10, 1000 Ljubljana, Slovenia

<p dir="auto"><br class="trailing-break"></p>
<p dir="auto"><br class="trailing-break"></p>

CERTIFIED SYSTEM

ISO/IEC 27001

Information security management

Partners and Integrations

Payments, POS, eCommerce and professional partners connect BillKO with the way you do business.

SIQ • CERTIFICATE

Certificate for management system

KUPUJ ONLINE d.o.o.

Fiorella La Guardie 13, 51000 Rijeka, Croatia

Development, delivery and maintenance of digital products

Information Security Records, Declaration of Applicability (SoA) 2025, version 1.0 of October 28, 2025

appropriately applies and maintains a management system that meets the requirements of the standard

ISO/IEC 27001:2022

Certificate number

I-0192

Date of certification

2025-10-30

Edition

01 / 2025.10-30

Valid until:

2028-10-30

SIQ Ljubljana · Mašera-Spasićeva street 10, 1000 Ljubljana, Slovenia

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Need an answer for your situation?

Tell us how you issue invoices, get paid or sell, and we will guide you to the most useful next step.

Need an answer for your situation?

Tell us how you issue invoices, get paid or sell, and we will guide you to the most useful next step.

Need an answer for your situation?

Tell us how you issue invoices, get paid or sell, and we will guide you to the most useful next step.