{
  "summary": "Initialize a transaction",
  "description": "Initialize a one-time charge for a customer; Paystack returns an authorization URL the customer is redirected to.",
  "request": {
    "method": "POST",
    "url": "https://api.paystack.co/transaction/initialize",
    "headers": {
      "Authorization": "Bearer sk_test_xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx",
      "Content-Type": "application/json"
    },
    "body": {
      "email": "customer@example.com",
      "amount": 500000,
      "currency": "NGN",
      "reference": "order_12345",
      "callback_url": "https://example.com/paystack/callback",
      "metadata": {
        "order_id": "12345",
        "custom_fields": [
          { "display_name": "Cart Items", "variable_name": "cart_items", "value": "3" }
        ]
      }
    }
  },
  "response": {
    "status": 200,
    "body": {
      "status": true,
      "message": "Authorization URL created",
      "data": {
        "authorization_url": "https://checkout.paystack.com/0peioxfhpn",
        "access_code": "0peioxfhpn",
        "reference": "order_12345"
      }
    }
  }
}