script.liquid

{% comment %}
  Preferred option order:

  {{ options.tag_to_add_after_verifying__required }}
  {{ options.verification_email_subject__required }}
  {{ options.verification_email_body__multiline_required }}
  {{ options.verification_confirmed_email_subject__required }}
  {{ options.verification_confirmed_email_body__multiline_required }}
  {{ options.verification_webhook_event_topic__required }}
{% endcomment %}

{% if event.topic == "shopify/customers/create" %}
  {% assign customer_tags = customer.tags | split: ", " %}
  {% unless customer_tags contains options.tag_to_add_after_verifying__required %}
    {% assign verification_code = "now" | date: "%s" | append: customer.email | sha256 | slice: 0, 6 | upcase %}
    {% action "email" %}
      {
        "to": {{ customer.email | json }},
        "subject": {{ options.verification_email_subject__required | json }},
        "body": {{ options.verification_email_body__multiline_required | replace: "VERIFICATION_CODE", verification_code | strip | newline_to_br | json }},
        "reply_to": {{ shop.customer_email | json }},
        "from_display_name": {{ shop.name | json }}
      }
    {% endaction %}

    {% assign cache_key = customer.email | downcase | sha256 | prepend: "customer_verification_code:" %}
    {% action "cache", "set", cache_key, verification_code %}
  {% endunless %}
{% elsif event.topic == options.verification_webhook_event_topic__required %}
  {% assign cache_key = event.data.customer_email | downcase | sha256 | prepend: "customer_verification_code:" %}
  {% assign submitted_verification_code = event.data.verification_code %}
  {% assign required_verification_code = cache[cache_key] %}
  {% assign customer = shop.customers[event.data.customer_email] %}

  {% if event.preview %}
    {% assign submitted_verification_code = "123ABC" %}
    {% assign required_verification_code = "123ABC" %}
    {% assign customer = hash %}
    {% assign customer["admin_graphql_api_id"] = "gid://shopify/Customer/1234567890" %}
    {% assign customer["email"] = "customer@example.com" %}
  {% endif %}

  {% if customer == nil %}
    {"log": {{ event.data.customer_email | json | prepend: "Unable to locate customer for submitted email address " | json }}}
  {% elsif required_verification_code == nil %}
    {"log": {{ event.data.customer_email | json | prepend: "No verification code on file for customer " | json }}}
  {% elsif required_verification_code != submitted_verification_code %}
    {"log": {{ event.data.customer_email | json | prepend: "Submitted verification code did not match the code on file for customer " | json }}}
    {"log": {{ required_verification_code | json | prepend: "Verification code on file: " | json }}}
  {% else %}
    {% action "email" %}
      {
        "to": {{ customer.email | json }},
        "subject": {{ options.verification_confirmed_email_subject__required | json }},
        "body": {{ options.verification_confirmed_email_body__multiline_required | strip | newline_to_br | json }},
        "reply_to": {{ shop.customer_email | json }},
        "from_display_name": {{ shop.name | json }}
      }
    {% endaction %}
    {% action "cache", "del", cache_key %}
    {% action "shopify" %}
      mutation {
        tagsAdd(
          id: {{ customer.admin_graphql_api_id | json }}
          tags: {{ options.tag_to_add_after_verifying__required | json }}
        ) {
          userErrors {
            field
            message
          }
        }
      }
    {% endaction %}
  {% endif %}
{% endif %}