Integration for Számlázz.hu and FluentCart is a WordPress plugin that seamlessly connects your FluentCart store with Számlázz.hu, automatically generating professional invoices when orders are paid. External Services This plugin relies on the Számlázz.hu invoice generation service to create and mana
PricingFree downloadThe WordPress.org download is free. Pro versions, add-ons or external services may cost extra.
CompatibilityRequires WordPress 6.2 and PHP 7.4.
SourceWordPress plugins · Oct 21, 2026
01 / Source details
Aboutthistool.
Integration for Számlázz.hu and FluentCart is a WordPress plugin that seamlessly connects your FluentCart store with Számlázz.hu, automatically generating professional invoices when orders are paid.
External Services
This plugin relies on the Számlázz.hu invoice generation service to create and manage invoices for FluentCart orders.
Service Information: * Service Provider: Számlázz.hu (szamlazz.hu) * Service Purpose: The plugin connects to Számlázz.hu’s Agent API to automatically generate invoices, fetch taxpayer information from the Hungarian Tax Authority (NAV), and retrieve generated invoice PDFs.
Data Transmission:
The plugin sends the following data to https://www.szamlazz.hu/szamla/ when:
01Generating Invoices (when an order is marked as paid): Your Számlázz.hu Agent API Key
02Order information: order number, dates, amounts, currency
03Buyer information: name, email, address, postal code, city, country
Important: By using this plugin, you agree to transmit your store and customer data to Számlázz.hu. Ensure you have proper consent from your customers and comply with applicable data protection regulations (GDPR, etc.).
Shipping VAT Management – Easily set and apply VAT rates for shipping
Cache Management – Built-in cache system with easy cleanup
Bilingual Admin Interface – Full support for English and Hungarian languages
Subscription Support – Automatically generates invoices for subscription renewals
Requirements
WordPress 5.0 or higher
FluentCart plugin installed and activated
Active Számlázz.hu account with Agent API Key
PHP 7.4 or higher
Important Warnings
Before using this plugin in production:
12Enable Test Mode in both FluentCart and Számlázz.hu
13Generate test invoices to verify everything works correctly
14Consult with your accountant to ensure the plugin meets your accounting requirements
15Review all generated invoices for accuracy
16Test all edge cases relevant to your business
This plugin generates official accounting documents. Incorrect invoices can have legal and tax implications.
API Usage Costs
Számlázz.hu charges for API usage. This plugin uses the Számlázz.hu Agent API to generate invoices automatically, which is a paid service. Review the Számlázz.hu pricing before enabling automatic invoice generation.
Limitations
VAT Rates : Only explicit rates supported (0%, 5%, 18%, 27%). Named VAT keys (AAM, TAM, TEHK) are not supported.
Document Types : Only Invoices can be generated. Receipts and Pro forma invoices are not supported.
IPN : Instant Payment Notification is not yet supported.
Lag : Customers might need to wait a few seconds on the order conrifmation page before being able to download the invoice.
Shipping VAT : FluentCart shipping VAT may contain minor rounding errors . This is a known bug in FluentCart, which will be corrected in the following releases. The shipping VAT on the invoice is calculated correctly according to Hungarian legal regulations. This may cause a small difference (fraction of a Forint) between what the customer pays, and what appears on the invoice.
Language Support
The admin interface is available in: * English (Default) * Hungarian (Magyar)
The interface language follows your WordPress language settings.
Configuration
17Navigate to Settings > Számlázz.hu
18Enter your Számlázz.hu Agent API Key ( How to get API key )
19Configure invoice settings: Invoice Language (default: Hungarian)
20Invoice Type (Paper Invoice or E-Invoice)
21Quantity Unit (default: “db”)
22Shipping Title (default: “Szállítás”)
23Shipping VAT Rate (default: 27%)
24Save settings
Additional Information
Troubleshooting for advanced users
Enable WP_DEBUG to see debug information on each orders activity log.
Support
For general questions, please visit the plugin website . Bug reports and feature requests can be submitted on the project’s GitHub page.
Contributing
This plugin is open source. Contributions are welcome!
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