{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://api-evangelist.github.io/payfast/json-schema/payfast-subscription-update.json",
  "title": "PayFast Subscription Update Request",
  "description": "Schema for updating parameters of an existing PayFast recurring billing subscription.",
  "type": "object",
  "minProperties": 1,
  "properties": {
    "cycles": {
      "type": "integer",
      "minimum": 0,
      "description": "Number of remaining billing cycles. 0 means indefinite.",
      "example": 12
    },
    "frequency": {
      "type": "integer",
      "enum": [3, 4, 5, 6],
      "description": "Billing frequency: 3=monthly, 4=quarterly, 5=biannually, 6=annually",
      "example": 3
    },
    "run_date": {
      "type": "string",
      "format": "date",
      "description": "Next billing run date in YYYY-MM-DD format",
      "example": "2026-07-01"
    },
    "amount": {
      "type": "integer",
      "minimum": 1,
      "description": "New recurring billing amount in cents (ZAR)",
      "example": 9900
    }
  },
  "additionalProperties": false
}