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.

POSThttps://api.zenpayz.com/merchant/api/v1/invoices/:invoiceId/pay

Bearer · API key

Request

Path Parameters

Parameter	Type	Description
invoiceId REQUIRED	string	The invoice ID (e.g. inv_a1b2c3d4e5f6g7h8)

Response

Success (200 OK)

{
  "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

Code	HTTP	Message
INVOICE_NOT_FOUND	404	Invoice does not exist
INVOICE_ALREADY_PAID	409	Invoice has already been fully paid
INVOICE_CANCELLED	409	Cannot pay a cancelled invoice

Examples

cURL

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

SDK

const payment = await zenpays.invoices.pay('inv_a1b2c3d4e5f6g7h8');

console.log(payment.checkoutUrl); // Redirect customer to this URL

Related Endpoints

• Public Invoice
• Get Invoice
• Generate Payment Link