curl --request POST \
  --url https://api.cashful.africa/api/canary/checkout/sessions \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "merchantId": "<string>",
  "currency": "<string>",
  "metadata": {
    "orderId": "ORD-12345",
    "source": "web"
  }
}
'

{
  "id": "checkout_sess_123",
  "merchantId": "merchant_456",
  "paymentIntentId": "pi_123456789",
  "customerId": "customer_789",
  "sessionUrl": "https://pay.cashful.africa/?entityType=checkout&entityId=checkout_sess_123",
  "successUrl": "https://example.com/success",
  "cancelUrl": "https://example.com/cancel",
  "lineItems": [
    {
      "productId": "product_001",
      "quantity": 2,
      "amount": 5000,
      "currency": "ZAR"
    },
    {
      "productId": "product_002",
      "quantity": 1,
      "amount": 3000,
      "currency": "ZAR"
    }
  ],
  "totalAmount": 13000,
  "currency": "ZAR",
  "mode": "payment",
  "status": "open",
  "expiresAt": "2025-01-17T10:30:00.000Z",
  "createdAt": "2025-01-15T10:30:00.000Z",
  "updatedAt": "2025-01-15T10:30:00.000Z"
}