Authorization

I am generating a key, having no expiration, for authorization and it is getting expired in 24 hrs. The records that I pushed using the API are also gone. When I generated a new key, and tried to pull the records that I saved yesterday, I found out that they are not present in DB anymore. I am using demo version. The API that I am using is from AtroCore REST API documentation. Can someone help me solve this problem I am facing?