Follow below mentioned steps to easily get your PayUMoney Merchant Key and Merchant Salt Live Credentials :
Step 1: Go to PayUMoney
Step 2: If you have created an account with PayUMoney, login, else Create Account
Step 3:Enter your email address here
Step 4:Once you have logged in into your account, click on Integration Details option under Integration Help
Step 5:Here are your Live Credentials - Merchant Key and Merchant Salt.