BNPL - v2 Payment API

Buy Now Pay Later (BNPL) allows your customers to spread their payments over a relatively short period instead of paying upfront. You can collect payments from customers with BNPL using the Merchant Hosted Checkout integration.

You need to ensure that BNPL for the paymentMethod.name parameter and BNPL code based on the provider and tenure for the paymentMethod.bankcode parameter is posted.

For the list of supported BNPL codes, refer to BNPL Codes.

Environment


Test Environment	https://apitest.payu.in/v2/payments
Production Environment	https://api.payu.in/v2/payments>

Request header

Parameter	Description
date	The current date and time. For example, format of the date is Wed, 28 Jun 2023 11:25:19 GMT.
authorization	The actual HMAC signature generated using the specified algorithm (sha512) and includes the hashed data. For more information, refer to authorization fields description.

authorization fields description

Field	Description
username	Represents the username or identifier for the client or merchant, for example smsplus.
algorithm	Use SHA512 algorithm for hashing and send this as header value.
headers	Specifies which headers have been used in generating the hash, for example date.
signature	The HMAC signature generated using the specified algorithm. For more information, refer to hashing algorithm.

hashing algorithm

You must hash the request parameters using the following hash logic:

Hash logic: sha512(<Body data> + '|' + date + '|' + merchant_secret)

Where <Body data> contains the request body posted with the request.

Sample header code

var merchant_key = 'smsplus';
var merchant_secret = 'izF09TlpX4ZOwmf9MvXijwYsBPUmxYHD';
// date
var date = new Date();
date = date.toUTCString();

// authorization
var authorization = getAuthHeader(date);

function getAuthHeader(date) {
    var AUTH_TYPE = 'sha512';
    var data = isEmpty(request['data']) ? "" : request['data'];
    var hash_string = data + '|' + date + '|' + merchant_secret;
    var hash = CryptoJS.SHA512(hash_string).toString(CryptoJS.enc.Hex);
    return `hmac username="${merchant_key}", algorithm="${AUTH_TYPE}", headers="date", signature="${hash}"`;
}

Request body

Parameter	Description	Example
accountId `mandatory`	`String` The merchant key provided by PayU during onboarding.	MERCHANT123
txnId `mandatory`	`String` Transaction ID for transaction tracking and this must be unique for every transaction.	REF123456
paymentMethod `mandatory`	`Object` Details about the payment method used. For BNPL payments: • name: Must be "BNPL" • bankCode: BNPL provider code (refer to BNPL Codes)	{"name": "BNPL", "bankCode": "LAZYPAY"}
order `mandatory`	`Object` Details about the transaction order including product information, ordered items, user-defined fields, and payment charge specifications. For more information, refer to order object fields description.
additionalInfo `mandatory`	`Object` Additional information including transaction flow configuration and BNPL-specific options. For more information, refer to additionalInfo object fields description.
callBackActions `mandatory`	`Object` Actions to perform on the payment server in different scenarios. For more information, refer to callBackActions object fields description.
billingDetails `mandatory`	`Object` Billing details of the customer including name, address, phone number, email, etc. For more information, refer to billingDetails object fields description.

paymentMethod object fields description

Field	Description	Example
name `mandatory`	`String` This field must contain the payment mode code. For BNPL payments, this must be "BNPL". For more information, refer to Payment Mode Codes.	BNPL
bankCode `mandatory`	`String` This field must contain the BNPL provider code based on the provider and tenure. For more information, refer to BNPL Codes.	LAZYPAY

order object fields description

Parameter	Description	Example
productInfo `mandatory`	Product details.	Product details
orderedItem `optional`	Details about the items ordered.	Array of Objects
userDefinedFields `optional`	Custom fields for additional information. Fields: udf1, udf2, udf3, udf4, udf5, udf6, udf7, udf8, udf9, udf10. For more information, refer to	Object
paymentChargeSpecification `mandatory`	Includes amount and charges. For more information, refer to paymentChargeSpecification object fields description	Object

paymentChargeSpecification object fields description

Parameter	Description	Example
price `mandatory`	The transaction amount.	1000
netAmountDebit `optional`	Net amount to be debited.	1000
taxSpecification `optional`	Tax details of the product/order.	Object
convenienceFee `optional`	Fees format (e.g., CC:12).	CC:12
offers `optional`	Offers applied or available for the payment.	Object

userDefinedFields object fields description

Field	Description
udf1	User defined field.
udf2	User defined field.
udf3	User defined field.
udf4	User defined field.
udf5	User defined field.
udf6	User defined field.
udf7	User defined field.
udf8	User defined field.
udf9	User defined field.
udf10	User defined field.

additionalInfo object fields description

Parameter	Description	Example
enforcePaymethod `optional`	Force a transaction with a specified method (e.g., CC, DC).	CC
forcePgid `optional`	Forces identification for payment gateway.	PG123
partnerHoldTime `optional`	Time held by the partner for the transaction.	60
userCredentials `optional`	Credentials for user authentication.	string
userToken `optional`	Token for the customer.	user_token_123
subventionAmount `optional`	Amount paid through EMI subvention payments.	100
authOnly `optional`	Initiates an authentication-only payment (true/false).	false
createOrder `optional`	A flag to store the order details (true/false).	true
txnS2sFlow `optional`	For defining seamless/non-seamless flows in handling payments.	seamless

BNPL-specific parameters:

Field	Description	Example
txnS2sFlow `optional`	`String` Transaction server-to-server flow configuration for BNPL payments.	4
createOrder `optional`	`String` Whether to create an order during the payment process.	false

callBackActions object fields description

Parameter	Description	Example
successAction `mandatory`	URL to be called on payment success.	https://example.com/success
failureAction `mandatory`	URL to be called on payment failure.	https://example.com/failure
cancelAction `mandatory`	URL to be called if user cancels the payment.	https://example.com/cancel
codAction `optional`	URL for Cash on Delivery (COD) action.	https://example.com/cod

billingDetails object fields description

Parameter	Description	Example
firstName `mandatory`	First name of the billing contact.	Ashish
lastName `optional`	Last name of the billing contact.	Kumar
address1 `mandatory`	Primary billing address.	123 Main Street
address2 `optional`	Secondary billing address.	Apt 4B
phone `optional`	Phone number of the billing contact.	9123456789
email `mandatory`	Email address of the billing contact.	[email protected]
city `optional`	City of the billing address.	Bharatpur
state `optional`	State of the billing address.	Rajasthan
country `optional`	Country of the billing address.	India
zipCode `optional`	Postal/Zip code of the billing address.	321028

Sample request

curl --location 'https://apitest.payu.in/v2/payments' \
--header 'date: Thu, 27 Mar 2025 10:12:27 GMT' \
--header 'authorization: hmac username="smsplus", algorithm="sha512", headers="date", signature="ec84843a663143bb89391f6fa2d4b9404bab1543a3eee81263b4a507ebf5d289d8fad1fbcdd59da820951e3e0f9b0b0b3d1bad9b41338804e7c42a8a6197c6e9"' \
--header 'Content-Type: application/json' \
--data-raw '{
    "accountId": "smsplus",
    "referenceId": "b5f2d8785768087678fn4",
    "amount": 5000,
    "currency": "INR",
    "paymentSource": "WEB",
    "paymentMethod": {
        "name": "BNPL",
        "bankCode": "LAZYPAY"
    },
    "order": {
        "productInfo": "BNPL Payment for Fashion Items",
        "userDefinedFields": {
            "udf1": "",
            "udf2": "",
            "udf3": "",
            "udf4": "",
            "udf5": "",
            "udf6": "",
            "udf7": "",
            "udf8": "",
            "udf9": "",
            "udf10": ""
        },
        "paymentChargeSpecification": {
            "price": "5000.00"
        }
    },
    "additionalInfo": {
        "txnS2sFlow": "4",
        "createOrder": "false"
    },
    "callBackActions": {
        "successAction": "https://yoursite.com/success",
        "failureAction": "https://yoursite.com/failure",
        "cancelAction": "https://yoursite.com/cancel"
    },
    "billingDetails": {
        "firstName": "John",
        "lastName": "Doe",
        "phone": "9876543210",
        "email": "[email protected]",
        "city": "Mumbai",
        "state": "Maharashtra",
        "country": "India",
        "zipCode": "400001"
    }
}'

Sample response

{
    "referenceId": "b5f2d8785768087678fn4",
    "paymentId": "1999110000001769",
    "message": "Please call verify api to get the transaction status"
}

Response parameters

Parameter	Description
txnId	This parameter contains the transaction ID of the transaction.
paymentId	This parameter contains the payment ID of the transaction.
message	This parameter contains the status message of the transaction.

📘
Reference:
To check the transaction status, refer to Verify Payment API.