For each event you register, you must define which fields to transmit to your App Builder application. The payload of an event can be massive. In addition, some events include sensitive or PCI compliance data by default. The payload of the observer.catalog_product_save_after event is similar to the following:

{
   "event":{
      "data":{
         "value":{
            "_edit_mode":true,
            "store_id":"0",
            "entity_id":"3",
            "attribute_set_id":"4",
            "type_id":"simple",
            "sku":"test2",
            "has_options":false,
            "required_options":false,
            "created_at":"2022-07-28 14:13:40",
            "updated_at":"2022-09-06 20:37:25",
            "row_id":"3",
            "created_in":"1",
            "updated_in":"2147483647",
            "name":"test2",
            "meta_title":"test2",
            "meta_description":"test2 ",
            "page_layout":"product-full-width",
            "options_container":"container2",
            "url_key":"test2",
            "msrp_display_actual_price_type":"0",
            "gift_message_available":"2",
            "gift_wrapping_available":"2",
            "is_returnable":"2",
            "status":"1",
            "visibility":"4",
            "tax_class_id":"2",
            "price":"123.000000",
            "meta_keyword":"test2",
            "options":[
               
            ],
            "media_gallery":{
               "images":[
                  
               ],
               "values":[
                  
               ]
            },
            "tier_price":[
               
            ],
            "tier_price_changed":0,
            "quantity_and_stock_status":{
               "is_in_stock":"1",
               "qty":"333"
            },
            "category_ids":[
               "4"
            ],
            "is_salable":1,
            "stock_data":{
               "item_id":"3",
               "product_id":"3",
               "stock_id":"1",
               "qty":"333",
               "min_qty":"0",
               "use_config_min_qty":"1",
               "is_qty_decimal":"0",
               "backorders":"0",
               "use_config_backorders":"1",
               "min_sale_qty":"1",
               "use_config_min_sale_qty":"1",
               "max_sale_qty":"10000",
               "use_config_max_sale_qty":"1",
               "is_in_stock":"1",
               "notify_stock_qty":"1",
               "use_config_notify_stock_qty":"1",
               "manage_stock":"1",
               "use_config_manage_stock":"1",
               "stock_status_changed_auto":"0",
               "use_config_qty_increments":"1",
               "qty_increments":"1",
               "use_config_enable_qty_inc":"1",
               "enable_qty_increments":"0",
               "is_decimal_divided":0,
               "website_id":"0",
               "deferred_stock_update":"0",
               "use_config_deferred_stock_update":"1",
               "type_id":"simple",
               "min_qty_allowed_in_shopping_cart":[

               ]
            },
            "use_config_gift_message_available":"1",
            "use_config_gift_wrapping_available":"1",
            "current_product_id":"3",
            "affect_product_custom_options":"1",
            "current_store_id":"0",
            "product_has_weight":"1",
            "is_new":"0",
            "website_ids":{
               "1":"1"
            },
            "url_key_create_redirect":"test2",
            "ignore_links_flag":false,
            "can_save_custom_options":true,
            "save_rewrites_history":true,
            "can_save_bundle_selections":false,
            "is_custom_option_changed":true,
            "parent_id":0,
            "special_from_date_is_formated":true,
            "custom_design_from_is_formated":true,
            "news_from_date_is_formated":true,
            "news_to_date_is_formated":true,
            "is_changed_categories":false,
            "is_changed_websites":false,
            "force_reindex_eav_required":true
         },
         "_metadata":{
            "commerceEdition":"Adobe Commerce",
            "commerceVersion":"2.4.6-beta5",
            "eventsClientVersion":"1.0.1",
            "storeId":"0",
            "websiteId":"1",
            "storeGroupId":"0"
         },
         "source":"demo.demo"
      }
   }
}

You define an array of fields to transmit in your configuration file. Specify any field within an event's value object to ensure it is transmitted to an application. If the field is part of a secondary object, such as stock_data in the above example, use the format <object-name>.field. For example: stock_data.product_id.