Steps to install the BasisPay payment plugin for Drupal-commerce-v7.x
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1. Copy the "basispay" folder in the downloaded .zip file to "[Drupal commerce main folder]\sites\all\modules".
2. Login to Admin panel of the drupal commerce.
3. Navigate to "Site Settings" -> "Modules" , on the left side you will get list of modules.
4. Scroll down to "Payment Gateway(BasisPay)".
5. Install the plugin by changing the button "off" to "on" and save the configuration by clicking on "Save Configuration".
6. At right side there is drop down button with "Permissions" and "Configure".
7. Click on "Configure".
8. Scroll down to "BasisPay Payment Gateway" in the list of "Disabled payment method rules" ,click on enable and confirm.
9. "BasisPay Payment Gateway" will move to list of "Enabled payment method rules" , click on edit.
10. Scroll down to "Actions" section -> "Operations" tab ,click on "edit" button.
11. Scroll down to "Payment settings" , enter the "API Key" ,"Salt" and selcet the "Mode" ("TEST" mode is for testing the payment plugin and later change it to "LIVE" mode). 
12. "Save" it.
13. Brows the drupal commerce page, checkout some product you will get the "BasisPay Payment Gateway" payment option.