Hash Generation

Payment Hash

Hash required to make payment.

sha512(key|txnid|amount|productinfo|firstname|email|udf1|udf2|udf3|udf4|udf5||||||salt)

Code samples to generate hash are present here - JAVA,PHP.

For SI Payment

When doing Recurring(SI) transaction, Payment hash need to be calculated as mentioned here​

WebService Hash

To call any PayU API, you need to generate hash from your server using following pattern :

sha512(key|command|var1|salt)
where
key=YOUR KEY
command=Api Commands
salt= YOUR SALT
var1= default(if you want stored cards use var1 as user_credentials else default)