payu-pyapi

Python API for PayU unofficial subscription link generation and payment processing.

About

payu-pyapi is a Python library that simplifies integration with PayU's payment gateway, specifically for subscription-based payments. It provides a clean, object-oriented interface to handle:

• Subscription link generation with automatic hash calculation
• Transaction ID generation
• Subscription date management
• Payment hash generation for secure transactions
• Support for both test and production environments

Purpose

This library aims to:

• Simplify PayU Integration: Remove the complexity of manual hash generation and field preparation
• Type-Safe API: Provide structured classes for different PayU environments
• Subscription Management: Handle recurring billing setup with ease
• Security: Automate SHA512 hash generation for secure payment processing
• Flexibility: Support custom billing cycles, currencies, and subscription durations

Use Cases

• SaaS Platforms: Implement recurring subscription payments for your software service
• Membership Sites: Handle monthly/yearly membership fees
• Content Platforms: Manage subscription-based content access
• Service Businesses: Automate recurring service payments
• E-commerce: Implement subscription-based product sales

Features

• Dual Environment Support: Easy switching between test and production modes
• Automatic Hash Generation: SHA512 hash calculation for payment security
• Subscription Management: Built-in support for billing cycles (MONTHLY, WEEKLY, YEARLY)
• Transaction ID Generation: Unique, timestamped transaction identifiers
• Flexible Configuration: Customizable currency, duration, and billing intervals
• Error Handling: Custom exceptions for clear error reporting
• Environment Variable Support: Secure credential management

Installation

pip install payu-pyapi

Quick Start

from payu_pyapi import payu_test_man, payu_production_man

MERCHANT_KEY = "your_merchant_key"
SALT = "your_salt"

# For test environment
manager = payu_test_man(MERCHANT_KEY, SALT, amount=99)

# For production environment
manager = payu_production_man(MERCHANT_KEY, SALT, amount=99)

API Usage

1. Subscription Manager Setup

Initialize the subscription manager with your PayU credentials and subscription parameters:

from payu_pyapi import payu_test_man

manager = payu_test_man(
    MERCHANT_KEY="your_key",
    SALT="your_salt",
    amount=99,                    # Billing amount
    productinfo="Premium Plan",   # Product name
    firstname="John",             # Customer first name
    email="john@example.com",     # Customer email
    currency="INR",               # Currency (default: INR)
    cycle="MONTHLY",              # Billing cycle: MONTHLY, WEEKLY, YEARLY
    duration=365                  # Subscription duration in days (default: 365)
)

2. Generate Subscription Link Data

Prepare the payment fields and generate the complete subscription link data with hash:

fields = {
    "firstname": "John",
    "email": "john@example.com",
    "phone": "9876543210",
    "productinfo": "Premium Plan",
    "surl": "https://yourdomain.com/success",
    "furl": "https://yourdomain.com/failure",
    "api_version": "7",
    "si": "1"
}

subscription_data = manager.generate_subscription_link_data(fields)
print(subscription_data)

The returned data includes:

• All original fields
• Auto-generated transaction ID
• Subscription details (si_details)
• Payment hash for security

3. Create Subscription Dates

Manually create subscription start and end dates:

from payu_pyapi import payu_test_man

manager = payu_test_man("your_key", "your_salt")

# Create dates for 1 year subscription
dates = manager.create_subscription_date(days=365)
print(dates)
# Output: {'paymentStartDate': '2026-07-29', 'paymentEndDate': '2027-07-29'}

# Create dates for custom duration
dates = manager.create_subscription_date(days=30)
print(dates)
# Output: {'paymentStartDate': '2026-07-29', 'paymentEndDate': '2026-08-28'}

4. Generate Subscription Details

Generate subscription information JSON:

from payu_pyapi import payu_subscription

dates = payu_subscription.create_subscription_date(days=365)
si_details = payu_subscription.get_si_details(
    amount=99,
    date_obj=dates,
    currency="INR",
    cycle="MONTHLY"
)
print(si_details)
# Output: {
#     'billingAmount': '99',
#     'billingCurrency': 'INR',
#     'billingCycle': 'MONTHLY',
#     'billingInterval': 1,
#     'paymentStartDate': '2026-07-29',
#     'paymentEndDate': '2027-07-29'
# }

5. Generate Payment Hash

Generate a secure hash for payment verification:

from payu_pyapi import payu_manager

fields = {
    'txnid': 'txn123',
    'amount': '100.00',
    'productinfo': 'Product Name',
    'firstname': 'John',
    'email': 'john@example.com',
    'si_details': {'billingAmount': '100', 'billingCurrency': 'INR', ...}
}

hash_value = payu_manager.generate_hash(
    fields,
    KEY="your_merchant_key",
    SALT="your_salt"
)
print(hash_value)

6. Generate Transaction ID

Generate a unique transaction ID:

from payu_pyapi import payu

txn_id = payu.generate_transaction_id()
print(txn_id)
# Output: TXN-20260729023045-A1B2C3D4E5F6

7. Complete Example

from payu_pyapi import payu_test_man

# Initialize manager
manager = payu_test_man(
    MERCHANT_KEY="your_key",
    SALT="your_salt",
    amount=99,
    productinfo="Premium Subscription",
    firstname="John",
    email="john@example.com",
    cycle="MONTHLY",
    duration=365
)

# Prepare payment fields
fields = {
    "phone": "9876543210",
    "surl": "https://yourdomain.com/success",
    "furl": "https://yourdomain.com/failure",
    "api_version": "7",
    "si": "1"
}

# Generate complete subscription data
subscription_data = manager.generate_subscription_link_data(fields)

# Use the data to create payment form or redirect
print(f"Transaction ID: {subscription_data['txnid']}")
print(f"Payment Hash: {subscription_data['hash']}")
print(f"Subscription Details: {subscription_data['si_details']}")

Classes

payu_manager

Base class for PayU API management.

Methods:

• generate_hash(fields, KEY, SALT): Generate SHA512 hash for payment verification
• generate_hash_self(fields): Generate hash and add to fields dictionary

payu_subscription

Extended manager for subscription payments.

Parameters:

• amount: Billing amount (default: 1)
• productinfo: Product description
• firstname: Customer first name
• email: Customer email
• currency: Currency code (default: INR)
• cycle: Billing cycle - MONTHLY, WEEKLY, YEARLY (default: MONTHLY)
• duration: Subscription duration in days (default: 365)

Methods:

• create_subscription_date(days): Create subscription start/end dates
• get_si_details(amount, date_obj, currency, cycle): Generate subscription details JSON
• generate_subscription_link_data(fields): Generate complete subscription data with hash

payu_test_man

Test environment manager (uses test.payu.in)

payu_production_man

Production environment manager (uses secure.payu.in)

Error

Custom exception for PayU API errors

Helper Functions

generate_transaction_id()

Generate a unique transaction ID in format: TXN-YYYYMMDDHHMMSS-RANDOM

get_test_data_json()

Get sample payment fields for testing (includes localhost URLs)

Environment Variables

For security, you can store credentials in environment variables:

export PAYU_KEY="your_merchant_key"
export PAYU_SALT="your_salt"

Then use in your code:

import os
from payu_pyapi import payu_test_man

manager = payu_test_man(
    MERCHANT_KEY=os.getenv("PAYU_KEY"),
    SALT=os.getenv("PAYU_SALT")
)

Error Handling

from payu_pyapi import payu_test_man, Error

try:
    manager = payu_test_man("", "")  # Invalid credentials
except Error as e:
    print(f"PayU Error: {e}")

License

GNU Affero General Public License v3.0 (AGPL-3.0)