fix(slack): show discount code flag

packages/medusa-plugin-slack-notification/src/services/slack.js

@@ -6,6 +6,8 @@ class SlackService extends BaseService {
   /**
    * @param {Object} options - options defined in `medusa-config.js`
    *    {
+   *      show_discount_code: If set to true the discount code used will be
+   *        displayed in the order channel.
    *      slack_url: "https://hooks.slack.com/services/...",
    *      admin_orders_url: "https:..../orders"
    *    }
@@ -119,6 +121,7 @@ class SlackService extends BaseService {
       })
     }
 
+    if (this.options_.show_discount_code) {
       order.discounts.forEach((d) => {
         blocks.push({
           type: "section",
@@ -130,6 +133,7 @@ class SlackService extends BaseService {
           },
         })
       })
+    }
 
     blocks.push({
       type: "divider",