We would like to inform you about difficulties in using the API of the VAT entity verification service
Please be advised that due to technical problems, from August 1, 2022, it may not be possible to use the API to check the VAT status of the entity.
We’re working to get the service back up and running as soon as possible.
For mass verification of the entity’s status in VAT – we encourage you to use the provided flat file .
Information on the use of the VAT taxpayers’ API is available on the List of VAT taxpayers page .
Sorry for the inconvenience.
Source: gov.pl