Step 1: Click on the “Create a Site for Xero Webhook”.
Step 2: In the newly opened Tab
...
After you have registered your Site domain, you can create a Site by clicking the New button in the Sites section.
...
...
For the new Site you will need to specify:
“Site Label” (use “Xero SiteService”)
“Site Name” (This should be automatically set, however check that it matches “Xero_SiteService”.
Set the Site to Active by clicking the “Active” checkbox
In the Active Home Site Page, select “Unauthorized” in the look-up field.
Click Save.
...
Next Step:
...