# Pay Invoice Initiate payment for an invoice. Creates a payment intent that the customer can use to complete the payment. :::note This is a **public endpoint** — no authentication headers are required. ::: ## Request ### Path Parameters ## Response ### Success (200 OK) ```json { "success": true, "data": { "invoiceId": "inv_a1b2c3d4e5f6g7h8", "paymentIntentId": "pi_x1y2z3w4v5u6t7s8", "amount": 275.00, "currency": "USD", "checkoutUrl": "https://checkout.zenpayz.com/pay/pi_x1y2z3w4v5u6t7s8" }, "message": "Payment initiated successfully", "error": null, "meta": { "request_id": "req_xxxxx", "timestamp": "2024-01-15T10:30:00.000Z", "processing_time_ms": 120, "api_version": "v1", "endpoint": "POST /invoices/:invoiceId/pay", "user_type": "merchant" } } ``` ### Error Responses ## Examples ```bash curl -X POST https://api.zenpayz.com/merchant/api/v1/invoices/inv_a1b2c3d4e5f6g7h8/pay \ -H "Content-Type: application/json" ``` ```javascript const response = await fetch('https://api.zenpayz.com/merchant/api/v1/invoices/inv_a1b2c3d4e5f6g7h8/pay', { method: 'POST', headers: { 'Content-Type': 'application/json', }, }); const result = await response.json(); console.log(result.data.checkoutUrl); // Redirect customer to this URL ``` ```javascript const payment = await zenpays.invoices.pay('inv_a1b2c3d4e5f6g7h8'); console.log(payment.checkoutUrl); // Redirect customer to this URL ``` ## Related Endpoints - [Public Invoice](/docs/rest-api/endpoints/billing/invoices/public-invoice) - [Get Invoice](/docs/rest-api/endpoints/billing/invoices/get-invoice) - [Generate Payment Link](/docs/rest-api/endpoints/billing/invoices/generate-payment-link)