Client secret: your Azure application client secret
save the new configuration
After the save you will see the field "Login URL" populated with an URL. Admin must provide this URL to all users that should authenticate to MyPay using Azure. Users must use this URL - the standard username/password authentication at MyPay login page will not work! Also you use this URL to allow accessing MyPay from Azure. See below.
Access MyPay from Azure
Users authenticated to Microsoft can have MyPay in the list of application registered with their account.
To enable accessing MyPay from Azure:
go to Azure portal as admin
go to Active Directory, App registration and select MyPay
In the menu, go to branding
set “Home Page URL” field - you can find the URL in MyPay at External Authentication Provider settings in “Login URL” field