eID API integration guide: patterns, code and security
Blog post from Didit
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An eID API enables onboarding systems to authenticate users through national electronic identity schemes and receive signed identity attributes without handling credentials directly, using five main interaction patterns: browser redirects, app-based comparison codes, QR or app launches, NFC chip-card reads, and EUDI Wallet presentations through OpenID4VP. Integrators must typically arrange scheme-specific contracts, certificates, brokers, or registration, while validating each returned assertion’s signature and level of assurance, managing cancellations and duplicate callbacks safely, and providing document-based alternatives for people without eIDs. The guide describes common implementations such as OIDC authorization-code flows, polling-based BankID, Smart-ID, and Mobile-ID flows, Germany’s NFC card process, and selectively disclosed wallet credentials, while emphasizing phishing-resistant QR methods, minimal data requests, PIN isolation within official apps, and webhook verification. It also outlines EU regulatory milestones, including AMLR requirements from July 2027 and EUDI Wallet acceptance obligations for certain private relying parties from December 2027, and presents Didit as a provider that consolidates several live eID schemes, document fallback, hosted workflows, sandbox testing, and standardized result formats behind a single API.
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