Jira cloud API Failing on Free active version

[varsha mane]

Hello

Yesterday We have created free jira core instance.. We tried to consume User related api's like create user, update user, delete user and get user.

Those was working yesterday.. 

But today for same instance and same API's it's giving 500 internal server error.

We are reffering these api's

https://docs.atlassian.com/jira/REST/cloud/#api/2/user-createUser

https://docs.atlassian.com/jira/REST/cloud/#api/2/user-updateUser

https://docs.atlassian.com/jira/REST/cloud/#api/2/user-removeUser

https://docs.atlassian.com/jira/REST/cloud/#api/2/user-getUser

Only get user api is working today..

This issue is happening from 19th June 2017.. 

Please let me know how to resolve this issue.. Your help will be great for us..

Thanks

Varsha