In the "Developer Hub" section, we have set up the API version "1.4", this version is used in all our clients.
![](https://uploads-eu-west-1.insided.com/intercom-en/attachment/edb2e9be-f9d2-4d6a-9cb4-e4444974fb38.png)
In the old API versions (for example, in 1.4), there is a method "Create or Update User". In the new API versions (for example, 2.11), the endpoint "api.intercom.io/users" is not described, but there is a Contacts documentation section, which describes similar methods.
Can we simultaneously use the old API version 1.4 for user management (through calls to "api.intercom.io/users") and the new API version 2.11 (through calls to "api.intercom.io/contacts"). For calls to the new Contacts API, we plan to use the HTTP header 'Intercom-Version': '2.11'.
Will such use of two different API versions break the logic of Intercom, will user/contact data be lost?