Event
This task is triggered anytime an event in Shopify happens. When task is created, Shopify webhook is created as well. The payload of the webhook will be available for your use inside task's code.
Here is an example of how you can add a tag to order anytime new order is created.
{% assign order = payload %}
{% capture mutation %}
  mutation tagsAdd($id: ID!, $tags: [String!]!) {
    tagsAdd(id: $id, tags: $tags) {
      node {
        id
      }
      userErrors {
        field
        message
      }
    }
  }
{% endcapture %}
{% json variables %}
  {
    "id": "{{ order.admin_graphql_api_id }}",
    "tags": "datajet-tag"
  }
{% endjson %}
{% assign result = mutation | graphql: variables %}Object payload is preloaded anytime task is triggered that is why it is available for us at very first line of the code. For readability we assign payload to order variable.
If you are not sure what is inside webhook payload you can reference this site provided by Shopify:
Complete list of events available in the app:
checkouts/delete 
checkouts/create 
checkouts/update
collections/delete 
collections/create 
collections/update 
customers/create 
customers/delete 
customers/disable 
customers/enable 
customers/update 
customer_groups/create 
customer_groups/delete 
customer_groups/update 
draft_orders/create 
draft_orders/delete 
draft_orders/update 
fulfillments/create 
fulfillments/update 
inventory_items/create 
inventory_items/delete 
inventory_items/update 
inventory_levels/connect 
inventory_levels/disconnect 
inventory_levels/update 
locations/create 
locations/delete 
locations/update 
orders/cancelled 
orders/create 
orders/delete 
orders/edited 
orders/fulfilled
orders/paid 
orders/partially_fulfilled 
orders/updated 
order_transactions/create 
products/create 
products/delete 
products/update 
refunds/create 
shop/update 
tender_transactions/create 
themes/create 
themes/delete 
themes/publish 
themes/update
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