WPJack works with these providers:
You can connect an unlimited number of Cloud accounts to your WPJack account.
A list of connected Cloud accounts is located on the Cloud Providers tab inside the Account page.
Linking Cloud Providers
You can link cloud providers from your Cloud Providers page. It is possible to link any number of cloud accounts, including multiple account for one cloud provider.
Linode & Digital Ocean
Linode and Digital Ocean provide oAuth authentication, so the only thing needed to link them to your account is to click on a link from the Cloud providers page and authorize a WPJack connection.
To connect to Hetzner, you must manually create an API token on the Hetzner account.
In Hetzner Cloud Console, inside your project, visit the left sidebar and click on the Security menu item. From there, open the API token tab and click the Generate API Token button. Enter the description for your token and choose Read & Write permissions.
API token must have read and write permissions, or WPJack won't be able to provision servers there.
You can see recording of the entire process at Install WordPress on Hetzner Cloud with SSL video.