Knowledge Base
e-invoicing
ICP-Brasil A1 Certificate
A digital certificate issued under Brazil's ICP-Brasil PKI, stored in software (type A1) and used to sign NF-e / NFS-e payloads submitted to SEFAZ and Receita Federal.
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A1 certificates are valid for one year, kept inside the e-invoicing system (no token), and bind every signed NF-e to the issuer's CNPJ. A3 certificates (hardware token) are an alternative but uncommon for cloud e-invoicing.
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