Merchant key provided by PayU during onboarding.

The transaction ID is a reference number for a specific order that is generated by the merchant.

A brief description of the product.

The first name of the customer.

The success URL, which is the page PayU will redirect to if the transaction is successful.

The Failure URL, which is the page PayU will redirect to if the transaction is failed.

The email address of the customer.

The last name of the customer.

The city name of the customer address.

The country as part of the customer address.

The country name which is part of the customer address. It must be only with the value as "IN" (for India).

It is the hash calculated by the merchant. The format for calculating the hash: sha512(key|txnid|amount|productinfo|firstname|email|udf1|udf2|udf3|udf4|udf5||||||SALT)

This parameter is used to identify whether it is a B2B transaction. If 1 is posted, it is a B2B transaction.

The Cancel URL, which is the page PayU will redirect to if the transaction is cancelled by customer.

This parameter must contain the buyer’s PAN (Permanent Account Number). If the transaction is of UPI mandate or UPI recurring then udf1 should contain the “Buyer's PAN and date of birth in the following format (separated by two pipe characters): Buyer's PAN||Buyer'sDOB

User-defined fields (udf) are used to store any information corresponding to a particular transaction. You can use up to five udfs in the post designated as udf1, udf2, udf3, udf4, udf5.

This parameter must contain the buyer’s DOB. If the transaction is of UPI mandate or UPI recurring then udf1 should contain the “invoice ID of the transaction (generated by the merchant) and merchant name in the following format (separated by two pipe characters): InvoiceID||MerchantName” (where, MerchantName is required for PA2PA integrations only)

This parameter must contain the “MerchantName” passed in udf3 in case of PA2PA integration, for UPI mandate consent and recurring txn, this field should not be passed.

This parameter must contain the “invoiceId” for every merchant, this field is mandatory during or after the transaction(using the udf_update API post successful transaction.