getProfile / updateProfile

MageSDK.getProfile().then(function(resp) {
  if (resp.success) {
    console.log(resp.data.profile.firstName, resp.data.profile.lastName);
  }
});

MageSDK.updateProfile({
  firstName: 'Jane',
  lastName: 'Doe',
  acceptsMarketing: true
}).then(function(resp) {
  if (resp.success) {
    console.log('Updated:', resp.data.profile);
  } else {
    console.log('Error:', resp.error);
  }
});

<form id="profile-form">
  <input name="firstName" id="firstName" placeholder="First name" />
  <input name="lastName" id="lastName" placeholder="Last name" />
  <label><input type="checkbox" id="marketing" /> Email me offers</label>
  <button type="submit">Save</button>
</form>

<script>
  var form = document.getElementById('profile-form');

  MageSDK.getProfile().then(function(resp) {
    if (!resp.success) return;
    document.getElementById('firstName').value = resp.data.profile.firstName;
    document.getElementById('lastName').value = resp.data.profile.lastName;
    document.getElementById('marketing').checked = resp.data.profile.acceptsMarketing;
  });

  form.addEventListener('submit', function(event) {
    event.preventDefault();
    MageSDK.updateProfile({
      firstName: document.getElementById('firstName').value,
      lastName: document.getElementById('lastName').value,
      acceptsMarketing: document.getElementById('marketing').checked
    }).then(function(resp) {
      alert(resp.success ? 'Saved' : 'Error: ' + resp.error);
    });
  });
</script>