Step 2: Confirm Product Display is OG, set user to member

{ "rules_step_2_confirm_product_display_is_og_set_user_to_member" : {
    "LABEL" : "Step 2: Confirm Product Display is OG, set user to member",
    "PLUGIN" : "rule",
    "REQUIRES" : [ "og" ],
    "USES VARIABLES" : {
      "line_item" : { "label" : "line_item", "type" : "commerce_line_item" },
      "product_display" : { "label" : "product_display", "type" : "node" },
      "user_purchased" : { "label" : "user_purchased", "type" : "user" }
    },
    "IF" : [ { "og_entity_is_group" : { "entity" : [ "product-display" ] } } ],
    "DO" : [
      { "og_subcribe_user" : { "user" : [ "user-purchased" ], "group" : [ "product-display" ] } }
    ]
  }
}