To set up PayUmoney with your Jumpseller Store, follow the steps:
You will need 3 items to setup your PayUmoney payment gateway in Jumpseller: Merchant ID, Merchant Salt and Authorization Header
After you login to your account at PayUmoney, you can find that fields at Manage Account > My Account > Merchant -Key Salt
Finally you only need copy this fields to the payment method configuration page on your Admin Panel and you are ready to sell with PayUmoney.
For more information download the guide from PayUmoney.