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Load the script

Load the Element from the CDN. The pk-specific URL is preferred because it embeds your tenant config (one fewer request, cached per key): 
<script src="https://cdn.filecheck.io/element/{pk}/filecheck.js" async></script>
Replace {pk} with your publishable key, for example pk_live_abc123. The generic fallback works but does not embed tenant config: 
<script src="https://cdn.filecheck.io/element/v1/filecheck.js" async></script>
Either URL attaches window.Filecheck once loaded.

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Handle async loading

With async, window.Filecheck is not available immediately. Poll for it before initializing: 
function waitForFilecheck(cb, timeout = 5000) {
  const start = Date.now();
  const t = setInterval(() => {
    if (window.Filecheck) { clearInterval(t); cb(window.Filecheck); }
    else if (Date.now() - start > timeout) { clearInterval(t); console.error('Filecheck failed to load'); }
  }, 50);
}

waitForFilecheck((Filecheck) => {
  const fc = Filecheck('pk_live_…');
  const intake = fc.elements.create('intake', { workflowId: 'wf_…' });
  intake.on('status', ({ canProceed, jobId }) => { /* … */ });
  intake.mount('#fc-slot');
});
Building a plugin? Use Filecheck.mount, which handles mounting, cart gating, and the proof gallery for you. Poll for window.Filecheck && window.Filecheck.mount.

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Sizing

The widget self-sizes. Give the mount element a width only, never a fixed height. The iframe is wrapped in Shadow DOM, so your CSS does not affect it. 
<div id="fc-slot" style="width: 100%; max-width: 480px;"></div>