Short answer
Book an appointment at the câmara municipal where you live and request the Certificado de Registo de Cidadão da União Europeia (CRUE). You'll typically need valid ID, proof of address and evidence of work or sufficient financial means, plus health cover. Requirements and fees vary by municipality, so check directly with your câmara before going.
General information, not legal or tax advice. Rules and amounts change: confirm with official sources.
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