Go to http://admin.google.com and click on "Apps".

Afterwards, click on "SAML apps".

Next, click on the yellow plus symbol in the right downer corner.

In the next window, click on "SETUP MY OWN CUSTOM APP".

Next, click "DOWNLOAD" at "Option 2". Save the file to your computer and click "NEXT".

Give a "Application Name" and click on "NEXT". 

Next, for "ACS URL" and "Entity ID" enter "https://<base-url>/plugins/servlet/samlsso" (without quotes) and substitute "<baseURL>" with the URL to your Atlassian product.

For "Name ID", make sure that "Basic Information" and "Primary Email" are chosen and that "Name ID Format" is set to "UNSPECIFIED".

Click "NEXT" to continue.

Click "Finish".

After setting up the app, it is turned OFF. To activate it, click on "OFF for everyone".

Check "ON for everyone" and click "SAVE".

In your Atlassian product, open the in-product marketplace as described in the Atlassian documentation.
Search for "resolution saml" and click "Install" for SAML Single Sign On (SSO) by resolution Reichert Network Solutions GmbH. 


After the installation is complete, click on Manage, then choose Configure. 

Now, you are on the Add-on / app configuration page and the first step of the setup wizard will appear.

Configure the SAML SSO App

After you clicked "Configure", the Wizard will be triggered. If not, or if you want to add another Identity Prover (IdP) to your existing configuration, click on "+ Add IdP". This guide assumes, that you there is no IdP configured.
The Wizard greets you with information, click on "Add new IdP" to proceed.

Choose "Google GSuite" for the "IdP Type".

Click "Next".

Click on "Select Metadata XML File".

Select the file you have downloaded before and click "Choose".

Click on "Import".

Click "Next" to continue.

If you configured your Atlassian product and your Identity Provider in a common way, you do not need to change anything here. In that case, just click "Next".

Testing SSO

The wizard also allows to test the Single Sign On. Just follow the steps to test if the login works as expected. 

Click on "Start test" to proceed.

Copy the red marked link and open a new incognito/private tab or a different web browser. Then, paste the link and navigate to it. 

You will be now redirected to GSuite's login page. Please log-in with you username and password. 

If everything worked fine, you will logged in into your Atlassian product. In the other tab/browser in which you were configuring the SAML SSO plugin, you can see also the "SUCCESS" status, if everything worked as expected. Click Next to proceed.

SSO Redirection

As a last step, you can set the Enable SSO Redirect option. If set, all users will be redirected to Single Sign On, thus they will be logged in via the IdP. Click on Save & Close to finish the configuration.