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About BillKO
We are building a simpler way of doing business.
BillKO integrates invoicing, fiscalization, payment processing, POS, e-commerce, and reporting for small and medium-sized businesses in Croatia.
About BillKO
We are building a simpler way of doing business.
BillKO integrates invoicing, fiscalization, payment processing, POS, e-commerce, and reporting for small and medium-sized businesses in Croatia.
About BillKO
We are building a simpler way of doing business.
ISO/IEC 27001 information intermediary status, GDPR compliance, and how we protect data and our service
Why BillKO exists.
Why BillKO exists.
Why BillKO exists.
Small businesses shouldn't waste time manually copying data between payments, invoicing, fiscalization, and reporting. BillKO connects these steps into a clear, seamless daily workflow.
Small businesses shouldn't waste time manually copying data between payments, invoicing, fiscalization, and reporting. BillKO connects these steps into a clear, seamless daily workflow.
Today: invoicing, fiscalization and connected channels.
Today: invoicing, fiscalization and connected channels.
Today: invoicing, fiscalization and connected channels.
BillKO today covers B2C, B2B and B2G accounts, eInvoices, billing, POS, eCommerce, API and reporting. Further development follows the same goal: less administration for the owner and accountant.
The company behind the product.
BillKO is a product of KUPUJ ONLINE d.o.o., an information intermediary officially registered on the Tax Administration list. BillKO is certified according to the ISO/IEC 27001 standard; the certificate was issued by SIQ.
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
The company behind the product.
BillKO is a product of KUPUJ ONLINE d.o.o., an information intermediary officially registered on the Tax Administration list. BillKO is certified according to the ISO/IEC 27001 standard; the certificate was issued by SIQ.
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
The company behind the product.
BillKO is a product of KUPUJ ONLINE d.o.o., an information intermediary officially registered on the Tax Administration list. BillKO is certified according to the ISO/IEC 27001 standard; the certificate was issued by SIQ.
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
Partners that complement BillKO.
Partners that complement BillKO.
Partners that complement BillKO.
Together with payment, POS, technology, and expert partners, we connect billing, integrations, implementation, and data protection.
Company Details.
Company Details.
Company Details.
KUPUJ ONLINE d.o.o.
KUPUJ ONLINE d.o.o.
KUPUJ ONLINE d.o.o.
support@billko.eu
support@billko.eu
PHONE
PHONE
+385 91 460 1300
+385 91 460 1300
PIN
PIN
PIN
60186252821
60186252821
COMPANY ADDRESS
COMPANY ADDRESS
COMPANY ADDRESS
Ul. Fiorella La Guardie 13, 51000 Rijeka
Ul. Fiorella La Guardie 13, 51000 Rijeka
Get to know the product, not just the story.
In a short presentation, we will demonstrate BillKO through an invoice, billing, or an integration relevant to your business.
Get to know the product, not just the story.
In a short presentation, we will demonstrate BillKO through an invoice, billing, or an integration relevant to your business.
Get to know the product, not just the story.
In a short presentation, we will demonstrate BillKO through an invoice, billing, or an integration relevant to your business.