Integration for Számlázz.hu and FluentCart

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:

1. Generating Invoices (when an order is marked as paid):

   • Your Számlázz.hu Agent API Key
   • Order information: order number, dates, amounts, currency
   • Buyer information: name, email, address, postal code, city, country
   • Buyer’s VAT/tax number (if provided)
   • Product details: names, quantities, prices, VAT rates
   • Shipping information: title, amount, VAT rate
   • Invoice settings: language, type (paper/electronic)

2. Fetching Taxpayer Data (when a Hungarian VAT number is provided):

   • Your Számlázz.hu Agent API Key
   • The taxpayer’s 8-digit tax identification number (truncated from the full VAT number)

3. Downloading Invoice PDFs (when users click to download invoices):

   • Your Számlázz.hu Agent API Key
   • The invoice number

Legal Information:
* Számlázz.hu Terms of Service: https://www.szamlazz.hu/aszf/
* Számlázz.hu Privacy Policy: https://www.szamlazz.hu/adatvedelem/

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.).

Key Features

• Automatic Invoice Generation – Invoices are automatically created when orders are marked as paid
• Download Invoices – Every receipt download button is overriden with Számlázz.hu invoice download.
• Multi-language Support – Generate invoices in 11 languages: Hungarian, English, German, Italian, Romanian, Slovak, Croatian, French, Spanish, Czech, Polish
• Invoice Types – Choose between Paper Invoice and E-Invoice formats
• VAT Number Validation – Automatically fetches company data from NAV (Hungarian Tax Authority) when VAT number is provided
• Customizable Settings – Configure invoice language, type, quantity units, and shipping details
• 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:

1. Enable Test Mode in both FluentCart and Számlázz.hu
2. Generate test invoices to verify everything works correctly
3. Consult with your accountant to ensure the plugin meets your accounting requirements
4. Review all generated invoices for accuracy
5. Test 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.
• B2B Sales: Buyers must have an EU VAT ID. Local VAT ID only is not yet 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

1. Navigate to Settings > Számlázz.hu
2. Enter your Számlázz.hu Agent API Key (How to get API key)
3. Configure invoice settings:
   • Invoice Language (default: Hungarian)
   • Invoice Type (Paper Invoice or E-Invoice)
   • Quantity Unit (default: “db”)
   • Shipping Title (default: “Szállítás”)
   • Shipping VAT Rate (default: 27%)
4. Save 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!

Credits

• Author: Gábor Angyal
• Website: webshop.tech

1. 

   Plugin settings page

1.0.0

• Initial release
• Automatic invoice generation for FluentCart orders
• Multi-language support (11 languages)
• Paper Invoice and E-Invoice types
• VAT number validation with NAV integration
• Customizable quantity units and shipping titles
• Shipping VAT management with easy application to tax rates
• Cache management system
• Bilingual admin interface (English/Hungarian)
• Support for subscription renewals
• PDF caching and download functionality
• Debug logging when WP_DEBUG is enabled