Interswitch Webpay WooCommerce Payment Gateway allows you to accept payment on your WooCommerce store via Interswitch Webpay payment gateway.

Noted That:

To install correctly this interswitch-webpay-woocommerce-payment-gateway.zip.
Fisrt Download the interswitch-webpay-woocommerce-payment-gateway.zip to your computer
Extract/Open interswitch-webpay-woocommerce-payment-gateway.zip to Your Computer.
Then, Find readme.txt file inside interswitch-webpay-woocommerce-payment-gateway.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 "interswitch-webpay-woocommerce-payment-gateway.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 "interswitch-webpay-woocommerce-payment-gateway.zip" Downloaded plugin from your computer, Where you downloaded interswitch-webpay-woocommerce-payment-gateway.zip According to Step – 1 Above then, click on "Install Now"

6. Now, Click on "Active Plugin"

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

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

8. Now you configure yourself oR Watch video tutorial below about Interswitch Webpay WooCommerce Payment Gateway Configurtions and Settings or How to work "Interswitch Webpay WooCommerce Payment Gateway" 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 "Interswitch Webpay WooCommerce Payment Gateway" Activated Plugin from Plugin List.
Then, Click on "Settings" from Plugin that is Interswitch Webpay WooCommerce Payment Gateway
Now, Edit/Add/Config the setting and Click on "Save Changes" button,

Guide
Automatic Installation Login to your WordPress Admin area Go to “Plugins > Add New” from the left hand menu In the search box type “Interswitch Webpay WooCommerce Payment Gateway” From the search result you will see “Interswitch Webpay WooCommerce Payment Gateway” click on “Install Now” to install the plugin A popup window will ask you to confirm your wish to install the Plugin. Note: If this is the first time you’ve installed a WordPress Plugin, you may need to enter the FTP login credential information. If you’ve installed a Plugin before, it will still have the login information. This information is available through your web server host. Click “Proceed” to continue the installation. The resulting installation screen will list the installation as successful or note any problems during the install. If successful, click “Activate Plugin” to activate it. Open the settings page for WooCommerce and click the “Payment Gateways,” tab. Click on the sub tab for “Interswitch Webpay”. Configure your “Interswitch Webpay” settings. See below for details. Manual Installation Download the plugin zip file Login to your WordPress Admin. Click on “Plugins > Add New” from the left hand menu. Click on the “Upload” option, then click “Choose File” to select the zip file from your computer. Once selected, press “OK” and press the “Install Now” button. Activate the plugin. Open the settings page for WooCommerce and click the “Payment Gateways,” tab. Click on the sub tab for “Interswitch Webpay”. Configure your “Interswitch Webpay” settings. See below for details. Configure the plugin To configure the plugin, go to WooCommerce > Settings from the left hand menu, then click “Payment Gateways” from the top tab. You should see “Interswitch Webpay” as an option at the top of the screen. Click on it to configure the payment gateway. *You can select the radio button next to the Interswitch Webpay from the list of payment gateways available to make it the default gateway.* Enable/Disable – check the box to enable Interswitch Webpay Payment Gateway. Title – allows you to determine what your customers will see this payment option as on the checkout page. Description – controls the message that appears under the payment fields on the checkout page. Here you can list the types of cards you accept. Product ID – enter your Product Identifier for PAYDirect here. This will be given to you by Interswitch. Pay Item ID – enter your PAYDirect Payment Item ID here. This will be given to you by Interswitch. Mac Key – enter your Mac Key here. This will be given to you by Interswitch Test Mode – Tick this to enable test mode, remember to untick this if you are ready to accepting live payment on your site. Click on Save Changes for the changes you made to be effected.

Guide

Automatic Installation

Login to your WordPress Admin area
Go to “Plugins > Add New” from the left hand menu
In the search box type “Interswitch Webpay WooCommerce Payment Gateway”
From the search result you will see “Interswitch Webpay WooCommerce Payment Gateway” click on “Install Now” to install the plugin
A popup window will ask you to confirm your wish to install the Plugin.

Note:

If this is the first time you’ve installed a WordPress Plugin, you may need to enter the FTP login credential information. If you’ve installed a Plugin before, it will still have the login information. This information is available through your web server host.

Click “Proceed” to continue the installation. The resulting installation screen will list the installation as successful or note any problems during the install.
If successful, click “Activate Plugin” to activate it.
Open the settings page for WooCommerce and click the “Payment Gateways,” tab.
Click on the sub tab for “Interswitch Webpay”.
Configure your “Interswitch Webpay” settings. See below for details.

Manual Installation

Download the plugin zip file
Login to your WordPress Admin. Click on “Plugins > Add New” from the left hand menu.
Click on the “Upload” option, then click “Choose File” to select the zip file from your computer. Once selected, press “OK” and press the “Install Now” button.
Activate the plugin.
Open the settings page for WooCommerce and click the “Payment Gateways,” tab.
Click on the sub tab for “Interswitch Webpay”.
Configure your “Interswitch Webpay” settings. See below for details.

Configure the plugin

To configure the plugin, go to WooCommerce > Settings from the left hand menu, then click “Payment Gateways” from the top tab. You should see “Interswitch Webpay” as an option at the top of the screen. Click on it to configure the payment gateway.

You can select the radio button next to the Interswitch Webpay from the list of payment gateways available to make it the default gateway.

Enable/Disable – check the box to enable Interswitch Webpay Payment Gateway.
Title – allows you to determine what your customers will see this payment option as on the checkout page.
Description – controls the message that appears under the payment fields on the checkout page. Here you can list the types of cards you accept.
Product ID – enter your Product Identifier for PAYDirect here. This will be given to you by Interswitch.
Pay Item ID – enter your PAYDirect Payment Item ID here. This will be given to you by Interswitch.
Mac Key – enter your Mac Key here. This will be given to you by Interswitch
Test Mode – Tick this to enable test mode, remember to untick this if you are ready to accepting live payment on your site.
Click on Save Changes for the changes you made to be effected.

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Reffered: https://wordpress.org/