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{
  "data": {
    "email": "visitor@example.com"
  },
  "consent": true
}

{
  "id": "FORM_ID",
  "name": "Newsletter",
  "organizationName": "Example Studio",
  "type": "embedded",
  "fields": [
    { "name": "email", "type": "email", "label": "Email address", "required": true },
    { "name": "consent", "type": "checkbox", "label": "I agree to receive email updates.", "required": true }
  ],
  "styling": {},
  "successAction": {},
  "privacyUrl": "https://example.com/privacy"
}

<form id="signup-form">
  <fieldset id="signup-fields" disabled>
    <legend>Subscribe to email updates</legend>
    <label id="email-label" for="signup-email">Email address</label>
    <input id="signup-email" type="email" autocomplete="email" required>
    <label for="signup-consent">
      <input id="signup-consent" type="checkbox" required>
      <span id="consent-label"></span>
    </label>
    <a id="privacy-link" href="/privacy">Privacy notice</a>
    <button id="signup-submit" type="submit">Subscribe</button>
  </fieldset>
  <p id="signup-status" role="status" aria-live="polite"></p>
</form>
<script type="module">
  const endpoint = "https://api.smartest.email/api/v1/public/forms/FORM_ID";
  const form = document.querySelector("#signup-form");
  const fields = document.querySelector("#signup-fields");
  const button = document.querySelector("#signup-submit");
  const status = document.querySelector("#signup-status");
  let ready = false;
  let submitting = false;

  form.addEventListener("submit", async event => {
    event.preventDefault();
    if (!ready || submitting || !form.reportValidity()) return;
    submitting = true;
    button.disabled = true;
    try {
      const response = await fetch(endpoint + "/submit", {
        method: "POST",
        credentials: "omit",
        headers: { "Content-Type": "application/json", "Accept": "application/json" },
        body: JSON.stringify({
          data: { email: document.querySelector("#signup-email").value.trim() },
          consent: document.querySelector("#signup-consent").checked
        })
      });
      const result = await response.json();
      status.textContent = result.message || "Please try again.";
      if (response.ok) form.reset();
    } catch {
      status.textContent = "Please try again.";
    } finally {
      submitting = false;
      button.disabled = false;
    }
  });

  try {
    const response = await fetch(endpoint, { credentials: "omit" });
    if (!response.ok) throw new Error("Signup form unavailable");
    const config = await response.json();
    document.querySelector("#email-label").textContent =
      config.fields.find(field => field.name === "email").label;
    document.querySelector("#consent-label").textContent =
      config.fields.find(field => field.name === "consent").label;
    if (config.privacyUrl) {
      document.querySelector("#privacy-link").href = config.privacyUrl;
    }
    ready = true;
    fields.disabled = false;
  } catch (error) {
    status.textContent = error.message;
  }
</script>