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KSeF
REST API documentation for KSeF
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Description of how the website works
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Entity status in VAT
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KSeF REST API – documentation
.NET libraries (C#, Visual Basic), C/C++, Java, PHP, Python
REST API
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Tax Identification Number (NIP) monitoring
Add-in for MS Excel
Checking the JPK_VAT/CSV file
CLI/CMD client application
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English (UK)
Polski
English (UK)
English (UK) 
Polski