CreditTransaction

{
    "id": "string",
    "accountId": "string",
    "transactionType": "grant",
    "amount": 0,
    "balanceAfter": 0,
    "grantId": "string",
    "usageId": "string",
    "createdAt": "2019-08-24T14:15:22Z",
    "createdBy": "string",
    "testRecord": true,
    "reason": "Credit grant",
    "metadata": {
        "unit_price_cents": 0,
        "invoice_id": "string",
        "invoice_line_item_id": "string",
        "expires_at": "2019-08-24T14:15:22Z"
    }
}