PayFast Payment Form Request

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://api-evangelist.github.io/payfast/json-schema/payfast-payment-form.json",
  "title": "PayFast Payment Form Request",
  "description": "Schema for the PayFast standard redirect payment form POST fields, including subscription and tokenization parameters.",
  "type": "object",
  "required": ["merchant_id", "merchant_key", "amount", "item_name", "signature"],
  "properties": {
    "merchant_id": {
      "type": "string",
      "description": "PayFast merchant ID assigned during registration",
      "example": "10000100"
    },
    "merchant_key": {
      "type": "string",
      "description": "PayFast merchant key assigned during registration",
      "example": "46f0cd694581a"
    },
    "return_url": {
      "type": "string",
      "format": "uri",
      "description": "URL to redirect the customer to after a successful payment",
      "example": "https://www.example.com/return"
    },
    "cancel_url": {
      "type": "string",
      "format": "uri",
      "description": "URL to redirect the customer to if they cancel the payment",
      "example": "https://www.example.com/cancel"
    },
    "notify_url": {
      "type": "string",
      "format": "uri",
      "description": "Server-to-server ITN (Instant Transaction Notification) URL",
      "example": "https://www.example.com/notify"
    },
    "name_first": {
      "type": "string",
      "maxLength": 100,
      "description": "Customer first name",
      "example": "Jane"
    },
    "name_last": {
      "type": "string",
      "maxLength": 100,
      "description": "Customer last name",
      "example": "Smith"
    },
    "email_address": {
      "type": "string",
      "format": "email",
      "description": "Customer email address",
      "example": "jane@example.com"
    },
    "cell_number": {
      "type": "string",
      "description": "Customer cell phone number",
      "example": "+27821234567"
    },
    "m_payment_id": {
      "type": "string",
      "maxLength": 100,
      "description": "Merchant-assigned payment reference ID",
      "example": "order-1234"
    },
    "amount": {
      "type": "string",
      "pattern": "^\\d+\\.\\d{2}$",
      "description": "Payment amount in ZAR, formatted to exactly 2 decimal places",
      "example": "99.00"
    },
    "item_name": {
      "type": "string",
      "maxLength": 100,
      "description": "Name of the item or service being purchased",
      "example": "Premium subscription"
    },
    "item_description": {
      "type": "string",
      "maxLength": 255,
      "description": "Additional description of the item",
      "example": "Monthly premium plan"
    },
    "custom_int1": { "type": "integer", "description": "Custom integer field 1" },
    "custom_int2": { "type": "integer", "description": "Custom integer field 2" },
    "custom_int3": { "type": "integer", "description": "Custom integer field 3" },
    "custom_int4": { "type": "integer", "description": "Custom integer field 4" },
    "custom_int5": { "type": "integer", "description": "Custom integer field 5" },
    "custom_str1": { "type": "string", "maxLength": 255, "description": "Custom string field 1" },
    "custom_str2": { "type": "string", "maxLength": 255, "description": "Custom string field 2" },
    "custom_str3": { "type": "string", "maxLength": 255, "description": "Custom string field 3" },
    "custom_str4": { "type": "string", "maxLength": 255, "description": "Custom string field 4" },
    "custom_str5": { "type": "string", "maxLength": 255, "description": "Custom string field 5" },
    "email_confirmation": {
      "type": "integer",
      "enum": [0, 1],
      "description": "Send confirmation email to merchant (1=yes, 0=no)",
      "example": 1
    },
    "confirmation_address": {
      "type": "string",
      "format": "email",
      "description": "Email address to receive payment confirmation",
      "example": "merchant@example.com"
    },
    "currency": {
      "type": "string",
      "default": "ZAR",
      "description": "Transaction currency — currently only ZAR is supported",
      "example": "ZAR"
    },
    "payment_method": {
      "type": "string",
      "description": "Restrict the payment to a specific method (cc, dc, ef, mp, sc, mc, cd, vc)",
      "example": "cc"
    },
    "subscription_type": {
      "type": "integer",
      "enum": [1, 2],
      "description": "Subscription type: 1=recurring billing, 2=tokenization (future adhoc charges)"
    },
    "billing_date": {
      "type": "string",
      "format": "date",
      "description": "First billing date for recurring subscription (YYYY-MM-DD)",
      "example": "2026-07-01"
    },
    "recurring_amount": {
      "type": "string",
      "pattern": "^\\d+\\.\\d{2}$",
      "description": "Amount to charge on each recurring billing cycle (ZAR)",
      "example": "99.00"
    },
    "frequency": {
      "type": "integer",
      "enum": [3, 4, 5, 6],
      "description": "Billing frequency: 3=monthly, 4=quarterly, 5=biannually, 6=annually",
      "example": 3
    },
    "cycles": {
      "type": "integer",
      "minimum": 0,
      "description": "Number of billing cycles (0=indefinite)",
      "example": 12
    },
    "subscription_notify_email": {
      "type": "integer",
      "enum": [0, 1],
      "description": "Notify merchant of subscription events via email"
    },
    "subscription_notify_webhook": {
      "type": "integer",
      "enum": [0, 1],
      "description": "Notify merchant of subscription events via webhook"
    },
    "subscription_notify_buyer": {
      "type": "integer",
      "enum": [0, 1],
      "description": "Notify buyer of subscription events"
    },
    "signature": {
      "type": "string",
      "pattern": "^[a-f0-9]{32}$",
      "description": "MD5 signature of sorted, URL-encoded payment parameters",
      "example": "ad3e6c84d5e5f374a3a0431bc5acbc90"
    }
  },
  "additionalProperties": false
}