KoSIT-verified German e-invoices: generate & validate ZUGFeRD, Factur-X, XRechnung, EN 16931.
Free
One server, in payments & billing. KoSIT-verified German e-invoices: generate & validate ZUGFeRD, Factur-X, XRechnung, EN 16931.
Payments & Billing
KoSIT-verified German e-invoices: generate & validate ZUGFeRD, Factur-X, XRechnung, EN 16931.
The rest either hold an API key issued by the publisher or ask for nothing.
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