Pay Donation with paytm is the simplest of the available ways to do payment integration to your website.Person fillup the form and put amount .

Noted That:

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

6. Now, Click on "Active Plugin"

7. Then, See left sidemenu. "Paytm – Donation Plugin" folder is added on left sidemenu. Now, Click on "Paytm – Donation Plugin" folder.

Noted that: If you do not see "Paytm – Donation Plugin" folder on left sidemenu then, see at left sidemenu "Settings" or "Tools".

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

Guide
Download paytm pay plugin Upload plugin to your wordpress blog or website Install and activate plugin Integration In wordpress, Go to Paytm Settings -> Paytm Settings -> Set Paytm Configuarations and put shortcode [paytmpay] in page For Button Id and Button secret:- Signup/Sign In on paywithpaytm.com and fill in the profile details and bank details. Set the redirect url where you want to redirect after payment.

Guide

Download paytm pay plugin
Upload plugin to your wordpress blog or website
Install and activate plugin

Integration

In wordpress, Go to Paytm Settings -> Paytm Settings -> Set Paytm Configuarations
and put shortcode [paytmpay] in page
For Button Id and Button secret:-
- Signup/Sign In on paywithpaytm.com and fill in the profile details and bank details.
Set the redirect url where you want to redirect after payment.

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Reffered: https://wordpress.org/