Freelance PayPal Integration Developer
I'm a freelance .NET developer specializing in PayPal payment gateway integration. Connect your website, e-commerce platform, or business application to PayPal's payment processing system. Whether you need PayPal Standard checkout, Express Checkout, subscription billing, or mass payout systems, I build secure integrations that handle payments smoothly. From donation buttons to complex marketplace split payments, I implement PayPal solutions that work reliably for your business.
Services I Provide
- PayPal Standard Integration: Basic PayPal checkout with redirect to PayPal hosted pages - simple setup for product sales
- PayPal Express Checkout: Embedded PayPal checkout experience directly on your website for seamless user flow
- PayPal Subscribe Buttons: Recurring subscription billing with automatic renewals for membership sites and SaaS platforms
- PayPal REST API Integration: Modern API implementation with Payment objects, OAuth 2.0, and webhook support
- PayPal IPN (Instant Payment Notification): Real-time payment confirmations and order status updates via server callbacks
- Refund Processing: Automated or manual refund handling through PayPal API with transaction tracking
- PayPal Mass Payments: Bulk payout systems for affiliates, freelancers, or marketplace vendors
- PayPal Invoicing API: Create and send professional invoices with payment tracking and reminders
Advanced Features
- PayPal Webhooks: Real-time event notifications for payment completed, subscription cancelled, disputes opened
- PayPal Adaptive Payments: Split payments for marketplace platforms with parallel or chained payment flows
- Multi-Currency Support: Accept payments in 25+ currencies with automatic conversion
- PayPal Guest Checkout: Allow customers to pay without PayPal account using credit/debit cards
- Recurring Billing Management: Subscription upgrades, downgrades, cancellations, and payment retry logic
- Payment Dispute Handling: Webhook integration for chargebacks and dispute notifications with automated workflows
- PayPal Reference Transactions: Store payment methods for future charges without re-authentication
Common Integration Scenarios
- E-commerce PayPal Integration: Shopping cart checkout with PayPal for online stores (WooCommerce, Shopify, custom)
- Membership Site Subscriptions: Recurring monthly/annual billing for content platforms, courses, premium memberships
- Marketplace Split Payments: Automatic payment splitting between platform and vendors using Adaptive Payments
- Donation Processing: One-time and recurring donations for nonprofits with customizable donation forms
- Freelancer Payout Systems: Mass payout integration for gig platforms paying contractors
- Digital Product Sales: Instant PayPal checkout for downloadable products with license key delivery
Technologies I Use
Frequently Asked Questions - PayPal Integration
Do you create PayPal accounts for clients?
+No, you must create your own PayPal Business account at paypal.com. PayPal requires verification of your business identity, tax ID (EIN or SSN), and bank account information. I handle the technical integration after your PayPal account is approved and you have API credentials.
What's the difference between PayPal Standard and Express?
+PayPal Standard redirects customers to PayPal's website to complete payment, then returns them to your site. PayPal Express Checkout embeds the payment experience on your site with better user flow. Express provides more control over the checkout experience but requires more technical implementation, which I can build for you.
Can PayPal work with recurring subscriptions?
+Yes, PayPal supports recurring billing for subscriptions. I can integrate PayPal Subscribe buttons or use the Subscriptions API for membership sites, SaaS platforms, or any recurring billing needs. This includes automatic renewals, failed payment retry, and customer subscription management.
What happens if a customer disputes a PayPal payment?
+PayPal has a built-in dispute resolution center. I can integrate webhook notifications to alert you immediately when disputes occur, and implement workflows to handle refunds or provide evidence documentation for dispute resolution. The system logs all transaction details for dispute defense.
Do I need a PayPal Business account or can I use Personal?
+You need a PayPal Business account to accept payments on your website. Business accounts provide API access, can accept credit cards from non-PayPal users, support subscriptions, and offer necessary features for e-commerce integration. Personal accounts cannot process website payments.
What are PayPal's transaction fees?
+PayPal charges 2.9% + $0.30 per transaction in the US (rates vary by country and transaction volume). For non-profits, PayPal offers discounted rates of 2.2% + $0.30. High-volume businesses can negotiate lower rates. These fees are charged by PayPal directly, separate from my integration service.
Can you integrate PayPal with my existing shopping cart?
+Yes, I can integrate PayPal with existing e-commerce platforms (WooCommerce, Shopify, Magento) or custom shopping cart systems built in .NET. This includes order synchronization, inventory management, and automated fulfillment workflows after successful PayPal payments.