The google sign in button doesn't render unless I use the google.accounts.id.initialize() method. However to use the authorization code flow I need to use create and use a CodeClient by calling google.accounts.oauth2.initCodeClient() and then manually call a .prompt() method on this client object.

So I can't see how I am meant to have the user click on the sign in button and then start an authorization code flow without having the user have to deal with two separate popup windows. The first to authenticate themselves and the second to authorize the back end service.

Additional context:

• This is a single page application
• I am using my own back end service
• Google sign in is the only authentication option available