Django Integration Guide

This guide explains how to integrate Payments v2.0 models into your Django application, including payment creation, balance tracking, and withdrawal management.

Database Models (ORM)

Payments v2.0 provides 5 core models that you can use directly in your Django application:

Model Overview


from django_cfg.apps.payments.models import (
    Payment,           # Cryptocurrency deposit records
    Currency,          # Supported payment currencies
    UserBalance,       # User balance tracking
    Transaction,       # Immutable transaction history
    WithdrawalRequest  # Manual withdrawal requests
)

Model Relationships:

Payment → references Currency (ForeignKey) and User
UserBalance → one-to-one with User
Transaction → references User (many transactions per user)
WithdrawalRequest → references Currency and User
All models use standard Django ORM

Key Features:

✅ Standard Django Models - Use familiar ORM patterns
✅ No Custom Signals - v2.0 simplifies by removing signal complexity
✅ Direct Database Access - Query with standard Django ORM
✅ Type-Safe - Full type hints and validation

Payment Model

Cryptocurrency deposit records via NowPayments:


from django_cfg.apps.payments.models import Payment, Currency
from decimal import Decimal
 
# Create a payment
payment = Payment.objects.create(
    user=user,
    amount_usd=Decimal('99.99'),
    currency=Currency.objects.get(code='USDTTRC20'),
    description='Premium subscription deposit'
)
 
# Access payment properties
print(payment.internal_payment_id)  # PAY_20250114123456_abc12345
print(payment.status)                # 'pending'
print(payment.amount_display)        # '$99.99 USD'
print(payment.is_pending)            # True
print(payment.qr_data)              # Payment address for QR code
print(payment.get_explorer_link())  # Blockchain explorer URL
 
# Update status manually
payment.status = Payment.PaymentStatus.COMPLETED
payment.completed_at = timezone.now()
payment.save()

Payment Model Fields:

user - User who created the payment
internal_payment_id - Unique payment identifier (auto-generated)
amount_usd - Payment amount in USD (Decimal)
currency - ForeignKey to Currency model
pay_amount - Amount in cryptocurrency (Decimal)
provider - Always ‘nowpayments’ in v2.0
provider_payment_id - NowPayments payment ID
status - Payment status (pending, confirming, completed, etc.)
pay_address - Cryptocurrency payment address
transaction_hash - Blockchain transaction hash
description - Payment description

Currency Model

Supported payment currencies with token and network information:


from django_cfg.apps.payments.models import Currency
 
# Get active currencies
currencies = Currency.objects.filter(is_active=True)
 
# Get specific currency
usdt = Currency.objects.get(code='USDTTRC20')
print(usdt.display_name)  # "USDT (TRC20)"
print(usdt.token)         # "USDT"
print(usdt.network)       # "TRC20"
print(usdt.min_amount_usd)  # Decimal('1.00')
 
# Check currency properties
print(usdt.is_active)     # True
print(usdt.provider)      # 'nowpayments'

Currency Model Fields:

code - NowPayments currency code (e.g., USDTTRC20, BTC)
name - Full currency name
token - Token symbol (e.g., USDT, BTC)
network - Network name (e.g., TRC20, ERC20, Bitcoin)
decimal_places - Decimal precision for amounts
is_active - Whether currency is available for payments
provider - Always ‘nowpayments’ in v2.0
min_amount_usd - Minimum payment amount
sort_order - Display order in lists

UserBalance Model

User balance tracking with ORM-based calculation:


from django_cfg.apps.payments.models import UserBalance
 
# Get or create user balance
balance = UserBalance.objects.get_or_create_for_user(user)
 
# Access balance information
print(balance.balance_display)      # '$199.99 USD'
print(balance.balance_usd)          # Decimal('199.99')
print(balance.total_deposited)      # Decimal('250.00')
print(balance.total_withdrawn)      # Decimal('50.00')
print(balance.last_transaction_at)  # datetime
 
# Balance properties
print(balance.is_empty)             # False
print(balance.has_transactions)     # True
 
# Balance is calculated from Transaction records
# balance_usd = SUM(Transaction.amount_usd WHERE user=user)

UserBalance Model Fields:

user - OneToOneField to User
balance_usd - Current balance (Decimal, computed from transactions)
total_deposited - Lifetime total deposits
total_withdrawn - Lifetime total withdrawals
last_transaction_at - Timestamp of last transaction
created_at / updated_at - Timestamps

Transaction Model

Immutable transaction records for audit trail:


from django_cfg.apps.payments.models import Transaction
 
# Create a transaction (typically done automatically by payment system)
transaction = Transaction.objects.create(
    user=user,
    transaction_type=Transaction.TransactionType.DEPOSIT,
    amount_usd=Decimal('99.99'),  # Positive for credit
    balance_after=Decimal('199.99'),
    description='Payment completed - PAY_20250114_abc'
)
 
# Query transactions
transactions = Transaction.objects.filter(user=user).order_by('-created_at')
 
# Transaction properties
print(transaction.is_credit)       # True (amount > 0)
print(transaction.is_debit)        # False
print(transaction.amount_display)  # '+$99.99'
print(transaction.type_color)      # 'success' (for UI display)
 
# Transactions are IMMUTABLE - cannot be modified
# Attempting to modify will raise ValidationError

Transaction Types:

DEPOSIT - Cryptocurrency deposit completed
WITHDRAWAL - Withdrawal processed
PAYMENT - Payment to service/product
REFUND - Refund from payment
FEE - Service or network fee
BONUS - Promotional bonus credit
ADJUSTMENT - Manual balance adjustment

Transaction Model Fields:

user - ForeignKey to User
transaction_type - Type of transaction (see above)
amount_usd - Transaction amount (positive=credit, negative=debit)
balance_after - User balance after this transaction
payment_id - Related payment ID (optional)
withdrawal_request_id - Related withdrawal ID (optional)
description - Transaction description
metadata - JSON field for additional data

WithdrawalRequest Model

Manual withdrawal management with admin approval:


from django_cfg.apps.payments.models import WithdrawalRequest
 
# User creates withdrawal request
withdrawal = WithdrawalRequest.objects.create(
    user=user,
    amount_usd=Decimal('50.00'),
    currency=Currency.objects.get(code='USDTTRC20'),
    wallet_address='TExampleAddress123...',
    network_fee_usd=Decimal('1.00'),
    service_fee_usd=Decimal('0.50')
)
 
# Check withdrawal status
print(withdrawal.status)            # 'pending'
print(withdrawal.is_pending)        # True
print(withdrawal.can_be_cancelled)  # True
print(withdrawal.amount_display)    # '$50.00 USD'
print(withdrawal.final_amount_usd)  # Decimal('48.50') after fees
 
# Admin approves withdrawal
withdrawal.status = WithdrawalRequest.Status.APPROVED
withdrawal.approved_at = timezone.now()
withdrawal.admin_user = admin_user
withdrawal.save()
 
# After processing, mark completed
withdrawal.status = WithdrawalRequest.Status.COMPLETED
withdrawal.transaction_hash = 'blockchain_tx_hash'
withdrawal.completed_at = timezone.now()
withdrawal.save()

Withdrawal Status Flow:

PENDING - Awaiting admin review
APPROVED - Approved by admin, ready to process
PROCESSING - Being processed off-platform
COMPLETED - Funds sent, tx_hash recorded
REJECTED - Rejected by admin
CANCELLED - Cancelled by user

WithdrawalRequest Model Fields:

user - User requesting withdrawal
internal_withdrawal_id - Unique ID (WD_YYYYMMDDHHMMSS_UUID)
amount_usd - Withdrawal amount
currency - Cryptocurrency to send
wallet_address - Destination address
network_fee_usd / service_fee_usd / total_fee_usd - Fee breakdown
final_amount_usd - Amount after fees
status - Withdrawal status
transaction_hash - Blockchain tx hash (after sending)
admin_user / admin_notes - Admin approval info

Provider Integration

Working with NowPayments Provider


# Direct provider integration for status polling
from django_cfg.apps.payments.services.providers.nowpayments.provider import NowPaymentsProvider
from django_cfg.apps.payments.config import get_nowpayments_config
 
# Get provider config
config = get_nowpayments_config()
provider = NowPaymentsProvider(config)
 
# Check payment status
payment = Payment.objects.get(id=payment_id)
if payment.provider_payment_id:
    status_data = provider.get_payment_status(payment.provider_payment_id)
 
    # Update payment based on provider response
    payment.status = status_data['payment_status']
    if status_data.get('actually_paid'):
        payment.actual_amount = Decimal(str(status_data['actually_paid']))
    payment.save()

Admin Interface Integration

Admin Registration

The admin interface is automatically available for all 5 models:


# Admin interfaces at:
# /admin/payments/payment/              - PaymentAdmin
# /admin/payments/currency/             - CurrencyAdmin
# /admin/payments/userbalance/          - UserBalanceAdmin
# /admin/payments/transaction/          - TransactionAdmin
# /admin/payments/withdrawalrequest/    - WithdrawalRequestAdmin
 
# Each admin provides:
# - List views with filtering and search
# - Detail views with all field display
# - Custom actions (approve withdrawal, mark completed, etc.)
# - Read-only fields for timestamps and calculated values

Integration Examples

Custom Django Views

Integrate payments into your Django views:


from django.shortcuts import render, redirect
from django.contrib.auth.decorators import login_required
from django_cfg.apps.payments.models import Payment, Currency
from decimal import Decimal
 
@login_required
def create_deposit(request):
    """Create cryptocurrency deposit payment"""
 
    if request.method == 'POST':
        amount = Decimal(request.POST['amount'])
        currency_code = request.POST['currency']
 
        # Create payment directly using ORM
        payment = Payment.objects.create(
            user=request.user,
            amount_usd=amount,
            currency=Currency.objects.get(code=currency_code),
            description=f'Deposit by {request.user.username}'
        )
 
        return redirect('payment_detail', payment_id=payment.id)
 
    currencies = Currency.objects.filter(is_active=True)
    return render(request, 'create_deposit.html', {
        'currencies': currencies
    })
 
@login_required
def payment_detail(request, payment_id):
    """Display payment details with QR code"""
 
    payment = Payment.objects.get(id=payment_id, user=request.user)
 
    return render(request, 'payment_detail.html', {
        'payment': payment,
        'qr_code_url': payment.get_qr_code_url(size=300),
        'explorer_link': payment.get_explorer_link(),
        'status_color': payment.status_color,
    })

Django REST Framework Integration

Use with DRF serializers and viewsets:


from rest_framework import serializers, viewsets
from django_cfg.apps.payments.models import Payment, UserBalance
 
class PaymentSerializer(serializers.ModelSerializer):
    currency_name = serializers.CharField(source='currency.display_name', read_only=True)
    status_display = serializers.CharField(source='get_status_display', read_only=True)
 
    class Meta:
        model = Payment
        fields = [
            'id', 'internal_payment_id', 'amount_usd', 'currency', 'currency_name',
            'status', 'status_display', 'pay_address', 'transaction_hash',
            'created_at', 'completed_at'
        ]
        read_only_fields = ['internal_payment_id', 'pay_address', 'transaction_hash']
 
class BalanceSerializer(serializers.ModelSerializer):
    class Meta:
        model = UserBalance
        fields = ['balance_usd', 'total_deposited', 'total_withdrawn', 'last_transaction_at']
        read_only_fields = ['__all__']
 
class PaymentViewSet(viewsets.ReadOnlyModelViewSet):
    serializer_class = PaymentSerializer
 
    def get_queryset(self):
        return Payment.objects.filter(user=self.request.user)

Key Integration Benefits

Simple ORM Integration

✅ Direct Database Access - Use standard Django ORM
✅ No Service Layer - Work directly with models
✅ Familiar Patterns - Standard Django development
✅ Type Safety - Full type hints and validation

Admin Interface

✅ 5 Admin Views - Complete management interface
✅ Withdrawal Approval - Manual admin workflow
✅ Balance Monitoring - User balance tracking
✅ Transaction History - Complete audit trail

Balance System

✅ Immutable Transactions - Cannot be modified after creation
✅ ORM Calculation - Balance computed from transactions
✅ Audit Trail - Complete financial history
✅ Balance Validation - Prevents negative balances

🔥 Integration Complete!

Your Django application now has full cryptocurrency payment support with ORM-based balance tracking and a complete admin interface!

Django Integration Guide

Database Models (ORM)

Model Overview

Payment Model

Currency Model

UserBalance Model

Transaction Model

WithdrawalRequest Model

Provider Integration

Working with NowPayments Provider

Admin Interface Integration

Admin Registration

Integration Examples

Custom Django Views

Django REST Framework Integration

Key Integration Benefits

Simple ORM Integration

Admin Interface

Balance System

See Also

Payment System

Integration & Development

Configuration & Setup

Tools & Deployment

Django Integration Guide

Database Models (ORM)

Model Overview

Payment Model

Currency Model

UserBalance Model

Transaction Model

WithdrawalRequest Model

Provider Integration

Working with NowPayments Provider

Admin Interface Integration

Admin Registration

Integration Examples

Custom Django Views

Django REST Framework Integration

Key Integration Benefits

Simple ORM Integration

Admin Interface

Balance System

See Also

Payment System

Integration & Development

Configuration & Setup

Related Features

Tools & Deployment