Terminologies
You should be able to see Xero Billing on the list of integrations. Click on the button with a label, Link My Account.
Connect your Xero Account. Follow the process instructed by Xero.
Once you have gone back to the Integrations Page, you should be able to see the Xero listed with a status Pending Activation. There are now two available buttons at the bottom. The button at the left should be able to disconnect your account. The right button should be able to allow you to set up Xero Billing.
Changing the supported countries by selecting from the list of countries should automatically be saved.
The supported currencies are based on ISO 4217 Currency Codes. There is also an option to add currency. If you want to add a currency, select from the supported currencies. After confirming your change, click on the ADD CURRENCY button. Your changes should now be saved.
NOTE: Deletion of already added supported currencies are not allowed.
For the tax rates, only supported and non-system tax rates are editable. Only the name and tax rate can be changed.
For Australia, tax types of EXEMPTOUTPUT and OUTPUT are the ones that are editable. System-defined tax types like GSTONIMPORTS and EXEMPTEXPENSES are not editable. The unsupported ones will be displayed in italic.
Tax Rate names can also be ordered alphabetically by clicking on the column, Name. The arrow icon will indicate if it is in ascending or descending order.
Click on SAVE to confirm your changes. After the update, the updated values should be displayed.
Once you have finished setting up, click on the button, SET UP FINISHED.
A success message will appear, Xero Billing Set up successfully finished. This will indicate that you have already finished setting up Xero in your organization.