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Yes. The structured โ€œZalacznikโ€ (attachment) is allowed for tax-relevant data on quantities and unit prices. The feature is aimed at technical transactions in the energy sector, but any company can apply to use them.Each attachment is limited to 3 MB, and should not include any non-tax related materials (such as contracts, manuals, advertising).
No. B2C invoices in KSeF are optional.
We currently support Standard Invoices (VAT) and Credit Notes (KOR). We add support for more types as required by our customers.
In special cases we facilitate test NIPs and tokens to our clients. Get in touch with the support team if you require credentials for testing.

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