https://docs.stackin.io/en/blog Technical writing on issuing, consulting and cancelling NF-e and NFS-e: SEFAZ rejections, contingency, events and API integration. en Fri, 25 Sep 2026 12:00:00 GMT https://docs.stackin.io/en/blog/nfe-correction-letter https://docs.stackin.io/en/blog/nfe-correction-letter What a CC-e can and cannot correct, whether there is a deadline, the limit of 20 letters per NF-e and how to register the event with the SEFAZ. Fri, 25 Sep 2026 12:00:00 GMT nfe cce correction sefaz https://docs.stackin.io/en/blog/nfe-number-invalidation https://docs.stackin.io/en/blog/nfe-number-invalidation When the NF-e sequence skips numbers, the issuer must invalidate the range at the SEFAZ by the 10th of the following month. The deadline, the rules and how it differs from cancellation. Fri, 25 Sep 2026 12:00:00 GMT nfe sefaz invalidation numbering https://docs.stackin.io/en/blog/nfe-rejection-204 https://docs.stackin.io/en/blog/nfe-rejection-204 Rejection 204 means the SEFAZ already has an NF-e with the same model, state, issuer, series and number. Why it happens and how to fix it without issuing again. Fri, 25 Sep 2026 12:00:00 GMT nfe sefaz rejection integration https://docs.stackin.io/en/blog/nfe-rejection-539 https://docs.stackin.io/en/blog/nfe-rejection-539 NF-e rejection 539: duplicate with a different access key. What SEFAZ checks, why it happens and how to fix it without invoicing the same sale twice. Fri, 25 Sep 2026 12:00:00 GMT nfe rejection sefaz https://docs.stackin.io/en/blog/recipient-manifestation https://docs.stackin.io/en/blog/recipient-manifestation The four recipient manifestation events, their codes, the 90-day deadline set by Ajuste SINIEF 14/26, who must file and why it unlocks the full XML. Fri, 25 Sep 2026 12:00:00 GMT nfe sefaz manifestation api https://docs.stackin.io/en/blog/sefaz-unavailable https://docs.stackin.io/en/blog/sefaz-unavailable What to do when SEFAZ is unavailable: where to check the official status, what codes 108 and 109 mean, and how the SVC, EPEC and FS-DA contingency modes work. Fri, 25 Sep 2026 12:00:00 GMT nfe sefaz contingency issuance https://docs.stackin.io/en/blog/node-sdk https://docs.stackin.io/en/blog/node-sdk One class, four methods — issue, consult, cancel, reissue — typed end to end in TypeScript. Fri, 04 Sep 2026 12:00:00 GMT sdk node typescript integration https://docs.stackin.io/en/blog/create-account https://docs.stackin.io/en/blog/create-account Sign up, register a company, and generate the API or SDK key you'll authenticate with. Thu, 03 Sep 2026 12:00:00 GMT getting-started account keys https://docs.stackin.io/en/blog/environments https://docs.stackin.io/en/blog/environments homologation and production are a property of the key, not a request parameter — here's what that means in practice. Thu, 03 Sep 2026 12:00:00 GMT getting-started environments homologation https://docs.stackin.io/en/blog/quickstart https://docs.stackin.io/en/blog/quickstart From signup to a first authorized document in one request, using an API key against homologation. Thu, 03 Sep 2026 12:00:00 GMT getting-started quickstart api https://docs.stackin.io/en/blog/php-sdk https://docs.stackin.io/en/blog/php-sdk One class, four methods — issue, consult, cancel, reissue — typed with PHP 8.1 enums and named arguments. Tue, 01 Sep 2026 12:00:00 GMT sdk php integration https://docs.stackin.io/en/blog/go-sdk https://docs.stackin.io/en/blog/go-sdk One struct, four methods — Issue, Consult, Cancel, Reissue — typed and validated. Mon, 31 Aug 2026 12:00:00 GMT sdk go integration https://docs.stackin.io/en/blog/python-sdk https://docs.stackin.io/en/blog/python-sdk One class, four methods — issue, consult, cancel, reissue — typed and validated. Sun, 30 Aug 2026 12:00:00 GMT sdk python integration https://docs.stackin.io/en/blog/rest-api https://docs.stackin.io/en/blog/rest-api Plain HTTP, JSON in and out, one Bearer API key — no SDK required. Sat, 29 Aug 2026 12:00:00 GMT api rest integration https://docs.stackin.io/en/blog/nfe-issuance https://docs.stackin.io/en/blog/nfe-issuance The product-invoice surface of the API — same account, same key, same dashboard as NFS-e. Fri, 28 Aug 2026 12:00:00 GMT nfe product api https://docs.stackin.io/en/blog/nfse-issuance https://docs.stackin.io/en/blog/nfse-issuance The service-invoice surface of the API, backed by Brazil's national NFS-e authorizer. Fri, 28 Aug 2026 12:00:00 GMT nfse product api https://docs.stackin.io/en/blog/tax-passthrough https://docs.stackin.io/en/blog/tax-passthrough Taxes computed and broken out automatically for NF-e, without building a tax engine. Thu, 27 Aug 2026 12:00:00 GMT nfe tax icms https://docs.stackin.io/en/blog/issue-nfe https://docs.stackin.io/en/blog/issue-nfe Product invoice issuance — items, tax classification, and real SEFAZ transmission. Wed, 26 Aug 2026 12:00:00 GMT nfe issuance sefaz https://docs.stackin.io/en/blog/issue-nfse https://docs.stackin.io/en/blog/issue-nfse Service invoice issuance through the national NFS-e system — no per-city integration required. Wed, 26 Aug 2026 12:00:00 GMT nfse issuance adn https://docs.stackin.io/en/blog/solutions https://docs.stackin.io/en/blog/solutions The core needs of a fiscal integration in one place: issue NF-e, issue NFS-e, and automate the tax handling involved in issuance. Tue, 25 Aug 2026 12:00:00 GMT overview solutions https://docs.stackin.io/en/blog/features https://docs.stackin.io/en/blog/features Issuance, consultation, and cancellation of fiscal documents, with a single API and a dashboard to track the whole cycle. Mon, 24 Aug 2026 12:00:00 GMT overview product https://docs.stackin.io/en/blog/how-it-works https://docs.stackin.io/en/blog/how-it-works Three steps from account to authorized document: configure, integrate, ship. Mon, 24 Aug 2026 12:00:00 GMT overview getting-started