# Good to know

- **Money is in cents.** `value` and `custom_value` are whole numbers of cents: 184000 is $1,840.00.
- **Timestamps are ISO 8601,** like `2026-10-08T17:30:00Z`, both ways.
- **IDs are strings.** Contact IDs start with `nct_` and conversion IDs with `cnv_`. Store them as given.
- **A key sees one account.** Contacts and conversions from any other account answer 404.
- **Retries are safe.** Recording a conversion twice returns the first record instead of making a second.