Poland runs a national e-invoicing system called KSeF (Krajowy System e-Faktur). Business-to-business invoices are submitted to a government API in a schema called FA(3) , and the system hands back an official confirmation of receipt. If you sell software to Polish companies, you will meet it.

Source: [Dev.to](https://dev.to/stackedboost/polands-e-invoicing-system-has-no-javascript-sdk-so-i-published-the-validation-layer-j6m)

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