# SmsMessageCategory

A model the API reference uses in a request or a response. The operation pages link every field typed as this model here.

Compliance category of an outbound SMS. Carried on `SmsMessage.Properties` (see
`SmsMessageProperties`) so the send-time gate and the content / quiet-hours policy
(`SmsContentPolicy`) can distinguish message classes.

## Values

| Value | Description |
| --- | --- |
| `Transactional` | Transactional message tied to a specific interaction the recipient initiated or expects (payment link, receipt, invoice, one-time passcode). This is the platform's default when a caller sets no category: every SMS sender wired today is transactional. |
| `Marketing` | Promotional / marketing message. Requires express marketing consent and is subject to the stricter content and timing policy. Callers sending marketing SMS must set this explicitly; it is never inferred. |
| `Reminder` | Recurring reminder in an ongoing program the recipient enrolled in (an overdue-invoice reminder series, a scheduled payment nudge). Not marketing, but recurring, so CTIA requires the opt-out instruction to ride on the message itself and TCPA timing applies. |

## See also

- [All documentation](https://devportal.demo.winkpg.io/llms.txt): the machine-readable index of every public page on this site.