Is entering my VAT ID obligatory to pay for an extension?

No, entering your VAT ID is optional. But if needed, you can enter VAT ID in the customer account:

vat id

Or on the 2-nd step of checkout:

vat id

And if you are tax exempt, the tax will be removed automatically, and an appropriate payment method will be displayed.

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Didn’t you find the answer to your question? We are always happy to help you out.