Payments

Limits, holds, and blocks as rules — not as code comments.

Balance checks, daily limits, and corridor blocks evaluated deterministically, with the failing check named in the response.

Limit logic duplicated between the ledger service and the API gateway

Changing a threshold means a deploy, and no audit trail of who changed it

Ops has no way to preview what a limit change would decline

Withdrawal Approval

Approve a withdrawal only when the account has the funds, is within its daily limit, and is in good standing.

A **withdrawal** is approved
  if §withdrawal.funds is valid
  and §withdrawal.limit is valid
  and §withdrawal.account is valid.

withdrawal.funds. A **withdrawal** passes funds_check
  if the __amount__ of the **withdrawal** is less than the __available_balance__ of the **account**.

withdrawal.limit. A **withdrawal** passes limit_check
  if the __withdrawn_today__ of the **account** + the __amount__ of the **withdrawal** is less than or equal to the __daily_limit__ of the **account**.

withdrawal.account. A **withdrawal** passes account_check
  if the __status__ of the **account** is equal to "active"
  and the __frozen__ of the **account** is equal to false.

Run it yourself

Change the policy, change the input, evaluate. The same engine your application would call.

Policy

Input

{
  "withdrawal": {
    "amount": 200
  },
  "account": {
    "available_balance": 1450,
    "daily_limit": 500,
    "withdrawn_today": 100,
    "status": "active",
    "frozen": false
  }
}

Try:

More payments policies

Transaction Limits

Compliance

Clear a payment when it stays under the reporting threshold, avoids blocked corridors, and keeps the day's cumulative total in range.

Transaction Fraud Flag

Finance

Flag a transaction when the amount is unusually high and the location does not match the account.

API Rate Limiting

Access Control

Allow a request only if the account has not exceeded the monthly call limit for their plan.

We will implement your first policy with you.

Send us a rule you currently keep in application code and we will show you what it looks like as a versioned, traceable policy.

Talk to us