Smart-ID API: a developer's guide to RP API v3
Blog post from Didit
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Smart-ID is a mobile electronic identity and signing service operated by SK ID Solutions, widely used in Estonia, Latvia, and Lithuania, with more than 3.85 million users reported in October 2026. Its Relying Party API version 3 enables businesses to authenticate users or collect signatures through QR-based device links, same-device links, and push notifications, returning a signed certificate containing the user’s name, country-prefixed personal code, certificate level, and signature but not address, nationality, or portrait data. Integrations use HTTPS JSON sessions and require careful security measures including fresh random challenges, server-side secret handling, certificate-chain and signature validation, and protections against user enumeration and phishing. Smart-ID is assessed at a high assurance level nationally in the Baltic countries but is not an EU-notified eID scheme, meaning its suitability for AML and customer due-diligence processes varies by jurisdiction and may require legal review. Businesses can connect directly through an SK contract, through brokers, or via Estonia’s public-sector TARA gateway, while testing is available free in a demo environment with predefined outcomes. The text also describes pricing, user eligibility limitations, document-verification fallbacks, and Didit’s managed integration option, which combines Smart-ID verification with document, liveness, and AML-screening services.
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