> ## Documentation Index
> Fetch the complete documentation index at: https://developers.cloudtalk.io/llms.txt
> Use this file to discover all available pages before exploring further.

# Contact actions

> Max 10 actions are available in one request. Only sent parameters/values will be updated. If you want to clear the value, just set empty string for that attribute. After sending empty string for properties of `ContactNumber`, `ContactEmail`, `ContactsTag` or `ContactAttribute` all data from these properties will be cleared. When you send values for properties of `ContactNumber`, `ContactEmail`, `ContactsTag` or `ContactAttribute` only these data will be updated, all other will be cleared.



## API Specification

The full API specification for this endpoint is available in the [documentation index](https://developers.cloudtalk.io/llms.txt).


## Related topics

- [CloudTalk REST API: Call Center Automation Platform](/guides/introduction.md)
- [CloudTalk REST API v1.7 — Complete Developer Reference](/api-reference/overview.md)
- [CloudTalk API Rate Limits, Headers, and Throttling](/guides/rate-limiting.md)