Paypal Integration
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Integrate PayPal payment processing with support for express checkout, subscriptions, and refund management. Use when implementing PayPal payments, processing online transactions, or building e-commerce checkout flows.
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Frontmatter — 2 properties
| name | paypal-integration |
|---|---|
| description | Integrate PayPal payment processing with support for express checkout, subscriptions, and refund management. Use when implementing PayPal payments, processing online transactions, or building e-commerce checkout flows. |
| 1 | --- |
| 2 | name: paypal-integration |
| 3 | description: Integrate PayPal payment processing with support for express checkout, subscriptions, and refund management. Use when implementing PayPal payments, processing online transactions, or building e-commerce checkout flows. |
| 4 | ---A5 — No allowed-tools declared — no way to tell what this skill may touch |
| 5 | |
| 6 | # PayPal Integration |
| 7 | |
| 8 | Master PayPal payment integration including Express Checkout, IPN handling, recurring billing, and refund workflows. |
| 9 | |
| 10 | ## When to Use This Skill |
| 11 | |
| 12 | - Integrating PayPal as a payment option |
| 13 | - Implementing express checkout flows |
| 14 | - Setting up recurring billing with PayPal |
| 15 | - Processing refunds and payment disputes |
| 16 | - Handling PayPal webhooks (IPN) |
| 17 | - Supporting international payments |
| 18 | - Implementing PayPal subscriptions |
| 19 | |
| 20 | ## Core Concepts |
| 21 | |
| 22 | ### 1. Payment Products |
| 23 | |
| 24 | **PayPal Checkout** |
| 25 | |
| 26 | - One-time payments |
| 27 | - Express checkout experience |
| 28 | - Guest and PayPal account payments |
| 29 | |
| 30 | **PayPal Subscriptions** |
| 31 | |
| 32 | - Recurring billing |
| 33 | - Subscription plans |
| 34 | - Automatic renewals |
| 35 | |
| 36 | **PayPal Payouts** |
| 37 | |
| 38 | - Send money to multiple recipients |
| 39 | - Marketplace and platform payments |
| 40 | |
| 41 | ### 2. Integration Methods |
| 42 | |
| 43 | **Client-Side (JavaScript SDK)** |
| 44 | |
| 45 | - Smart Payment Buttons |
| 46 | - Hosted payment flow |
| 47 | - Minimal backend code |
| 48 | |
| 49 | **Server-Side (REST API)** |
| 50 | |
| 51 | - Full control over payment flow |
| 52 | - Custom checkout UI |
| 53 | - Advanced features |
| 54 | |
| 55 | ### 3. IPN (Instant Payment Notification) |
| 56 | |
| 57 | - Webhook-like payment notifications |
| 58 | - Asynchronous payment updates |
| 59 | - Verification required |
| 60 | |
| 61 | ## Quick Start |
| 62 | |
| 63 | ```javascript |
| 64 | // Frontend - PayPal Smart Buttons |
| 65 | <div id="paypal-button-container"></div> |
| 66 | |
| 67 | <script src="https://www.paypal.com/sdk/js?client-id=YOUR_CLIENT_ID¤cy=USD"></script> |
| 68 | <script> |
| 69 | paypal.Buttons({ |
| 70 | createOrder: function(data, actions) { |
| 71 | return actions.order.create({ |
| 72 | purchase_units: [{ |
| 73 | amount: { |
| 74 | value: '25.00' |
| 75 | } |
| 76 | }] |
| 77 | }); |
| 78 | }, |
| 79 | onApprove: function(data, actions) { |
| 80 | return actions.order.capture().then(function(details) { |
| 81 | // Payment successful |
| 82 | console.log('Transaction completed by ' + details.payer.name.given_name); |
| 83 | |
| 84 | // Send to backend for verification |
| 85 | fetch('/api/paypal/capture', {A4 — This skill pulls in web or user content but never says to treat that content as data. A signal, not proof. |
| 86 | method: 'POST', |
| 87 | headers: {'Content-Type': 'application/json'}, |
| 88 | body: JSON.stringify({orderID: data.orderID}) |
| 89 | }); |
| 90 | }); |
| 91 | } |
| 92 | }).render('#paypal-button-container'); |
| 93 | </script> |
| 94 | ``` |
| 95 | |
| 96 | ```python |
| 97 | # Backend - Verify and capture order |
| 98 | from paypalrestsdk import Payment |
| 99 | import paypalrestsdk |
| 100 | |
| 101 | paypalrestsdk.configure({ |
| 102 | "mode": "sandbox", # or "live" |
| 103 | "client_id": "YOUR_CLIENT_ID", |
| 104 | "client_secret": "YOUR_CLIENT_SECRET" |
| 105 | }) |
| 106 | |
| 107 | def capture_paypal_order(order_id): |
| 108 | """Capture a PayPal order.""" |
| 109 | payment = Payment.find(order_id) |
| 110 | |
| 111 | if payment.execute({"payer_id": payment.payer.payer_info.payer_id}): |
| 112 | # Payment successful |
| 113 | return { |
| 114 | 'status': 'success', |
| 115 | 'transaction_id': payment.id, |
| 116 | 'amount': payment.transactions[0].amount.total |
| 117 | } |
| 118 | else: |
| 119 | # Payment failed |
| 120 | return { |
| 121 | 'status': 'failed', |
| 122 | 'error': payment.error |
| 123 | } |
| 124 | ``` |
| 125 | |
| 126 | ## Detailed patterns and worked examples |
| 127 | |
| 128 | Detailed pattern documentation lives in `references/details.md`. Read that file when the navigation tier above is insufficient. |
| 129 | |
| 130 | ## Testing |
| 131 | |
| 132 | ```python |
| 133 | # Use sandbox credentials |
| 134 | SANDBOX_CLIENT_ID = "..." |
| 135 | SANDBOX_SECRET = "..." |
| 136 | |
| 137 | # Test accounts |
| 138 | # Create test buyer and seller accounts at developer.paypal.com |
| 139 | |
| 140 | def test_payment_flow(): |
| 141 | """Test complete payment flow.""" |
| 142 | client = PayPalClient(SANDBOX_CLIENT_ID, SANDBOX_SECRET, mode='sandbox') |
| 143 | |
| 144 | # Create order |
| 145 | order = client.create_order(10.00) |
| 146 | assert 'id' in order |
| 147 | |
| 148 | # Get approval URL |
| 149 | approval_url = next((link['href'] for link in order['links'] if link['rel'] == 'approve'), None) |
| 150 | assert approval_url is not None |
| 151 | |
| 152 | # After approval (manual step with test account) |
| 153 | # Capture order |
| 154 | # captured = client.capture_order(order['id']) |
| 155 | # assert captured['status'] == 'COMPLETED' |
| 156 | ``` |
| 157 |
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