Create a product_reference metafield

The type of the metafield you're going to create depends on the Raven carrying the message. If the value you're sending doesn't match the value type expected, the request will result in an error.

Vanilla JS

<!-- JavaScript + Liquid -->
<script type="text/javascript">
  fieldsRavenSubmit = (value) => {
    const ravenObj = {%- render 'raven-mac-gen', resource_id: customer.id, raven_id: 'TBD' -%}
    const valueObj = { value: value };
    const requestParams = { raven: Object.assign({}, ravenObj, valueObj) };
    const response = fetch('/apps/raven/create_metafield', {
      method: 'PUT',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify(requestParamsOne)
    })

    response
      .then(res => res.json())
      .then(resJson => console.log('resJson: ', resJson))
  }
</script>

<!-- HTML -->
<button id="fieldsraven-demo" onclick="ravenSubmit('{{ product.id }}')">Send the Raven!</button>

FieldsRaven Fetch wrapper (aka Storefront JS Kit)