Installation Steps

1. Upload the contents of the folder named commerce_paytm into ../sites/all/modules/
2. Enable the module at ../admin/build/modules
3. Open ../sites/all/modules/commerce_paytm/posttopaytm.php then enter
4. Your secret key in the file.
5. Enable Paytm as a payment method
6. Enter your Paytm Merchant id and Secret key
7. Set the Paytm payment mode to either one of the following:

• Live(Value = 1)
• Test(Value = 0)

8. Save the changes.

PLUGIN FILE DESCRIPTION:

The plugin has the following files.

• commerce_paytm.info
• commerce_paytm.module
• posttopaytm.php
• checksum.php

These are simple PHP files with different extensions

• commerce_paytm.info - This is simple file which has information about the payment module.
• commerce_paytm.module - This is the core file which includes all the funcionalities for the module like posting cart information to Paytm with checksum and getting the response etc ..,
• posttopaytm.php - This is the php file which is responsible for posting the form to the Paytm API.
• checksum.php - Cotains general functions to find checksum.

SPECIAL NOTE

Create a custom field for phone number named "phone number" and provide its machine name as "field_phone_number" at the checkout page.