This plugin allows your customers to pay via Barion Smart Gateway in your WooCommerce online store.

Noted That:

To install correctly this pay-via-barion-for-woocommerce.zip.
Fisrt Download the pay-via-barion-for-woocommerce.zip to your computer
Extract/Open pay-via-barion-for-woocommerce.zip to Your Computer.
Then, Find readme.txt file inside pay-via-barion-for-woocommerce.zip and Open readme.txt.
Now, Read the Requirements of this plugin. Which Wordpress Version and PHP Version are required to run this Plugin in Your Wordpress Site.
Then, Follow the the Tips Below.

Start the Tips:

1. First Download "pay-via-barion-for-woocommerce.zip" Plugin to your Local Computer. (Click Download)

2. Then, Login to your "yourdomain.com/wp-admin" Dashboard.

3. Then, Click on "Plugins" + "Add New" from left sidemenu of Dashboard.

4. Now, Click on "Upload Plugin" button.

5. Now, Browse "pay-via-barion-for-woocommerce.zip" Downloaded plugin from your computer, Where you downloaded pay-via-barion-for-woocommerce.zip According to Step – 1 Above then, click on "Install Now"

6. Now, Click on "Active Plugin"

7. Then, See left sidemenu. "Barion Payment Gateway for WooCommerce" folder is added on left sidemenu. Now, Click on "Barion Payment Gateway for WooCommerce" folder.

Noted that: If you do not see "Barion Payment Gateway for WooCommerce" folder on left sidemenu then, see at left sidemenu "Settings" or "Tools".

8. Now you configure yourself oR Watch video tutorial below about Barion Payment Gateway for WooCommerce Configurtions and Settings or How to work "Barion Payment Gateway for WooCommerce" in your WordPress site.

After Activated Plugin According to Step-6 then,

Go to "Plugins" + "Installed Plugin" from Wordpress Admin Panel Leftside Menu.
or Direct go to: https://yourdomain/wp-admin/plugins.php
Then, Find "Barion Payment Gateway for WooCommerce" Activated Plugin from Plugin List.
Then, Click on "Settings" from Plugin that is Barion Payment Gateway for WooCommerce
Now, Edit/Add/Config the setting and Click on "Save Changes" button,

Guide
Minimum Requirements WooCommerce 3.0 or later WordPress 4.0 or later The recommended way to install the plugin is through the “Plugins” menu in WordPress Navigate to Plugins > Add New > Search for “barion”, you should already see this plugin Hit “Install Now”, then enable the plugin Click on the menu item “WooCommerce” then select the “Checkout” tab Click on the new submenu item named “Barion” On this page you should set the POSKey of the shop and your Barion email address Should you want to use the test envorinment, select it from the Barion Environment dropdown. You’ll need to create a shop on the Barion test page. Enable the payment method if you’re ready to use Barion

Guide

Minimum Requirements

WooCommerce 3.0 or later
WordPress 4.0 or later

The recommended way to install the plugin is through the “Plugins” menu in WordPress
- Navigate to Plugins > Add New > Search for “barion”, you should already see this plugin
- Hit “Install Now”, then enable the plugin
Click on the menu item “WooCommerce” then select the “Checkout” tab
Click on the new submenu item named “Barion”
On this page you should set the POSKey of the shop and your Barion email address
Should you want to use the test envorinment, select it from the Barion Environment dropdown. You’ll need to create a shop on the Barion test page.
Enable the payment method if you’re ready to use Barion

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Reffered: https://wordpress.org/