To find out credentials for Amazon MWS, kindly follow below steps:

1. Request your amazon.in MWS credentials by clicking here

2. Click the radio button "I want to authorize an application to access my Amazon seller account with Amazon MWS."

3. Click the Next button and accept the agreement

4. Print out the resultant page and record your Merchant ID and MWS Authorization Token. This Merchant ID and MWS Authorization token needs to be entered on the add marketplace page.