> ## Documentation Index
> Fetch the complete documentation index at: https://baas-api-docs.rexmfbank.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Service subscriptions

> Subscribe to optional products such as Bills Payment

Some products are gated behind a subscription. [List available services](/api-reference/services/list-available-services)
returns the catalog, with `is_subscribed` for the authenticated partner.

Virtual accounts are not in this list. They are available as soon as the
partner account is provisioned — see [Virtual Accounts](/guides/virtual-vs-merchant-accounts).
Bills Payment is. A bills call before you subscribe returns `403 NOT_SUBSCRIBED`.

## Subscribe

Send the numeric `id` from the list to
[Subscribe to a service](/api-reference/services/subscribe-to-a-service):

```json theme={null}
{ "serviceId": 2 }
```

Put `serviceId` in the JSON body. The API also accepts it as a query
parameter, but the body is what you should send.

A second subscribe for the same service returns `409 ALREADY_SUBSCRIBED`.
After a successful subscribe, refresh the list — `is_subscribed` flips to
`true`. There is no unsubscribe endpoint.

Both calls use the same bearer token as other service endpoints. See
[Authentication](/authentication).