We were unable to process your payment

Error Reason
Invalid amount

Corrective Action
Please ensure that you send all mandatory parameters in the transaction request to PayU.

Mandatory parameters which must be sent in the transaction are:
key, txnid, amount, productinfo, firstname, email, phone, surl, furl, hash
The parameters which you have actually sent in the transaction are:

Mandatory parameter missing from your transaction request are:
key, txnid, productinfo, surl, hash, firstname, email, phone.

Please re-initiate the transaction with all the mandatory parameters.