1{
2  "$schema": "http://json-schema.org/draft-07/schema#",
3  "type": "object",
4  "properties": {
5    "subscriptionId": {
6      "type": "string",
7      "description": "Unique identifier for the subscription"
8    },
9    "customerId": {
10      "type": "string",
11      "description": "Unique identifier for the customer"
12    },
13    "invoiceId": {
14      "type": "string",
15      "description": "Unique identifier for the invoice"
16    },
17    "amount": {
18      "type": "number",
19      "description": "Amount due for payment"
20    },
21    "currency": {
22      "type": "string",
23      "description": "Currency code (ISO 4217)"
24    },
25    "dueDate": {
26      "type": "string",
27      "format": "date-time",
28      "description": "When the payment is due"
29    },
30    "billingPeriod": {
31      "type": "object",
32      "properties": {
33        "start": {
34          "type": "string",
35          "format": "date"
36        },
37        "end": {
38          "type": "string",
39          "format": "date"
40        }
41      },
42      "required": ["start", "end"]
43    },
44    "planId": {
45      "type": "string",
46      "description": "Subscription plan identifier"
47    },
48    "retryAttempt": {
49      "type": "integer",
50      "description": "Number of retry attempts for failed payments"
51    }
52  },
53  "required": ["subscriptionId", "customerId", "invoiceId", "amount", "currency", "dueDate"]
54}