# Integration API

- [Inbox API](/onetalk-omnichannel-documentation/onetalk-integration-api/inbox-api.md): The set of methods that can be used when for OneTalk Inbox
- [User/Contact API](/onetalk-omnichannel-documentation/onetalk-integration-api/user-contact-api.md): Use these sets of API if you wish to sync your user or contact into OneTalk's system.