Embed SDK

Reference for the @learncard/embed-sdk — zero-dependency credential claim button for any website

The Embed SDK lets you add a credential claim button to any webpage with a single script tag and one function call. No framework required — it renders a sandboxed iframe modal that handles the full email OTP verification and credential acceptance flow.

Installation

npm

npm install @learncard/embed-sdk

CDN (IIFE)

<script src="https://cdn.jsdelivr.net/npm/@learncard/embed-sdk@latest/dist/learncard.js"></script>

ESM

import { init } from '@learncard/embed-sdk';

Quick Start

<div id="claim-here"></div>

<script src="https://cdn.jsdelivr.net/npm/@learncard/embed-sdk@latest/dist/learncard.js"></script>
<script>
    LearnCard.init({
        publishableKey: 'pk_your_key_here',
        target: '#claim-here',
        credential: { name: 'My Template Name' },
        partnerName: 'Your Organization',
    });
</script>

Clicking the rendered button opens the claim modal. The user enters their email, receives an OTP, and accepts the credential into their LearnCard wallet.

How It Works

Architecture Details

• The modal runs in a sandboxed srcdoc iframe with allow-scripts allow-same-origin. All credential data and session tokens stay inside the iframe; the parent page cannot read them.

• The parent SDK communicates with the iframe via postMessage using a shared nonce for origin-safe message routing.

• Session JWT is stored in localStorage under lcEmbed:v1:{publishableKey}, persisting across page navigations so the user stays authenticated for subsequent claims.

• credential is resolved server-side: you can pass a full VC object or simply { name: 'Template Name' } and the backend resolves the template by name + your integration's publishableKey.

init(options)

Renders a "Claim Credential" button into target and wires up the full claim flow.

import { init } from '@learncard/embed-sdk';

init(options: InitOptions): void

InitOptions

Property	Type	Required	Description
target	string | HTMLElement	✅	CSS selector or DOM element to render the button into
credential	CredentialConfig	✅	Full VC object or { name: 'Template Name' } for server-side resolution
publishableKey	string	Recommended	Your integration's publishable key from the developer dashboard. Omit for stub/test mode.
partnerName	string	—	Displayed in the modal header next to your logo
branding	BrandingTokens	—	Color and logo customization (see below)
apiBaseUrl	string	—	Defaults to https://network.learncard.com/api
requestBackgroundIssuance	boolean	—	Issue credential without user interaction (no modal shown)
onSuccess	(details: ClaimSuccessDetails) => void	—	Called when user accepts. SDK always opens the wallet URL AND calls this callback. To suppress wallet auto-open, set branding.walletUrl: ''.
onEmailSubmit	(email: string) => Promise<EmailSubmitResult>	—	Override default email challenge logic
onOtpVerify	(email: string, code: string) => Promise<OtpVerifyResult>	—	Override default OTP verification logic
theme	{ primaryColor?: string }	—	Deprecated — use branding.primaryColor instead

BrandingTokens

Property	Type	Description
primaryColor	string	Hex color for buttons, stepper, and card accent. Defaults to #2EC4A5 (teal).
accentColor	string	Darker accent for hover states. Defaults to darken(primaryColor, 20%).
partnerLogoUrl	string	URL for your organization's logo in the modal header
logoUrl	string	Override the LearnCard brand logo
walletUrl	string	URL to open on success. Defaults to https://learncard.app. Set to '' to suppress auto-open entirely.

CredentialConfig

// Full VC object (any valid VerifiableCredential JSON):
credential: {
  "@context": ["https://www.w3.org/ns/credentials/v2", ...],
  "type": ["VerifiableCredential", "OpenBadgeCredential", ...],
  ...
}

// Template name shorthand (resolved server-side):
credential: { name: 'Course Completion' }

Using { name: '...' } is recommended for production — the generated embed snippet stays stable even if your credential template changes.

ClaimSuccessDetails

type ClaimSuccessDetails = {
    credentialId: string; // Issued credential ID
    consentGiven: boolean; // Whether user gave consent
    handoffUrl?: string; // Deep link to the credential in the user's wallet
};

Examples

Custom Branding

init({
    publishableKey: 'pk_...',
    target: '#claim-target',
    credential: { name: 'Course Completion' },
    partnerName: 'Learning Economy Academy',
    branding: {
        primaryColor: '#e11d48',
        accentColor: '#be123c',
        partnerLogoUrl: 'https://your-org.com/logo.png',
        walletUrl: 'https://app.learncard.com',
    },
});

Handle Success in Your UI

init({
    publishableKey: 'pk_...',
    target: '#claim-target',
    credential: { name: 'Course Completion' },
    onSuccess: ({ credentialId, handoffUrl }) => {
        document.getElementById('success-banner').style.display = 'block';
        // handoffUrl is available if you want to link to the wallet
    },
});

Custom Auth Handlers

If you manage your own user sessions, you can bypass the default email/OTP flow:

init({
    target: '#claim-target',
    credential: { name: 'Course Completion' },
    onEmailSubmit: async email => {
        await myApi.sendOtp(email);
        return { ok: true };
    },
    onOtpVerify: async (email, code) => {
        const result = await myApi.verifyOtp(email, code);
        if (!result.valid) return { ok: false, error: 'Invalid code' };
        return { ok: true };
    },
});

Stub Mode (No Backend)

Omit publishableKey to run the full UI flow without any network calls — useful for local development and visual testing:

init({
    target: '#claim-target',
    credential: { name: 'Test Credential' },
    partnerName: 'My Org',
    // No publishableKey → stub mode, all steps succeed silently
});

Browser Support

The SDK uses srcdoc iframe delivery and postMessage. Supported in all modern browsers (Chrome, Firefox, Safari, Edge). IE not supported.

Bundle Size

Format	Raw	Gzipped
IIFE (learncard.js)	~37KB	~10.5KB
ESM (learncard.esm.js)	~37KB	~10.5KB

Zero runtime dependencies. The claim modal UI is bundled inline as a minified string.

See Also

• How-To: Add an Embed Claim Button to Your Website

• Connect a User's LearnCard to Your Platform

• Partner Connect SDK — for apps embedded inside LearnCard