Balance JSON schema for refresh service. Balance field is nonNegativeInteger

balance.json

{
    "$metadata": {
        "uris": {
            "jsonLdContext": "https://gist.githubusercontent.com/ilya-korotya/314a60978556135485eca7e3275ec8cb/raw/8b6274eca26e18f656c877e63d13acd918421d4a/balance.jsonld"
        },
        "version": "1.0",
        "type": "Balance"
    },
    "$schema": "https://json-schema.org/draft/2020-12/schema",
    "description": "Schema for mumbai balance",
    "title": "Balance",
    "properties": {
        "credentialSubject": {
            "description": "Stores the data of the credential",
            "title": "Credential subject",
            "properties": {
                "id": {
                    "description": "Stores the DID of the subject that owns the credential",
                    "title": "Credential subject ID",
                    "format": "uri",
                    "type": "string"
                },
                "balance": {
                    "description": "balance",
                    "title": "balance",
                    "type": "string"
                },
                "address": {
                    "description": "balance owner",
                    "title": "owner",
                    "type": "string"
                }
            },
            "required": [
                "balance",
                "address"
            ],
            "type": "object"
        },
        "@context": {
            "type": [
                "string",
                "array",
                "object"
            ]
        },
        "expirationDate": {
            "format": "date-time",
            "type": "string"
        },
        "id": {
            "type": "string"
        },
        "issuanceDate": {
            "format": "date-time",
            "type": "string"
        },
        "issuer": {
            "type": [
                "string",
                "object"
            ],
            "format": "uri",
            "properties": {
                "id": {
                    "format": "uri",
                    "type": "string"
                }
            },
            "required": [
                "id"
            ]
        },
        "type": {
            "type": [
                "string",
                "array"
            ],
            "items": {
                "type": "string"
            }
        },
        "credentialSchema": {
            "properties": {
                "id": {
                    "format": "uri",
                    "type": "string"
                },
                "type": {
                    "type": "string"
                }
            },
            "required": [
                "id",
                "type"
            ],
            "type": "object"
        }
    },
    "required": [
        "credentialSubject",
        "@context",
        "id",
        "issuanceDate",
        "issuer",
        "type",
        "credentialSchema"
    ],
    "type": "object"
}