Step 1: Confirm line item has product display

{ "rules_step_1_confirm_line_item_has_product_display" : {
    "LABEL" : "Step 1: Confirm line item has product display",
    "PLUGIN" : "rule",
    "REQUIRES" : [ "rules" ],
    "USES VARIABLES" : {
      "line_item" : { "label" : "line_item", "type" : "commerce_line_item" },
      "user_purchased" : { "label" : "user_purchased", "type" : "user" },
      "product_display" : { "label" : "product_display", "type" : "node", "parameter" : false }
    },
    "IF" : [
      { "entity_has_field" : { "entity" : [ "line-item" ], "field" : "commerce_product" } }
    ],
    "DO" : [
      { "entity_query" : {
          "USING" : {
            "type" : "node",
            "property" : "field_product",
            "value" : [ "line-item:commerce-product:product-id" ],
            "limit" : "1"
          },
          "PROVIDE" : { "entity_fetched" : { "product_display_list" : "product_display_list" } }
        }
      },
      { "data_set" : { "data" : [ "product-display" ], "value" : [ "product-display-list:0" ] } }
    ],
    "PROVIDES VARIABLES" : [ "product_display" ]
  }
}