How to transfer the users from ionic Auth to other services?

Hi, guys
As you know Ionic team will no longer provide the Ionic Auth user authentication service which this service will end at ‘January 31, 2018’ Notice of upcoming changes to Ionic Cloud
which my app is based on the auth service
so how can transfer all users data from ionic service to another and using new authentication service ?

any suggestions ?

I got an email from Ionic saying they were in talks with other auth providers. So maybe wait a couple weeks to see what happens.