SFM Custom Actions of type Web Service allow you to invoke custom code. They are indicated by Webservice icon in the Actions menu, and are supported only when you are online. SFM Before Save and After Save events of type web service (SOAP) are only supported, and web services of type SFM Before Save/Insert are not supported.

Responses from a web service are updated to the record without the need of an addition data sync. If the configured web service sets / updates any field in the record for which it was invoked, the updated values are returned as a part of the same data sync itself. You can view the updated values once the ongoing data is synced. However, if the updates are done to other downloaded records, the subsequent data sync will fetch the changes. This is a pre-release feature.

The Apex web service details are same as in online. For sample Apex web service code, refer to Building Custom Apex Web Service for SFM.