When your credit balance is lower than the configuration value credit_balance_limit, you will get the event payload as below:
{
"event_type": "credit.balance.low",
"resource_type": "company",
"resource_id": "CHK100000",
"data": {
"available_balance": 100.0,
"balance": 150.00,
"currency": "HKD"
}
}