Following are the pre-requisites that would be required once you sign up. Make sure all below requirements are fulfilled.
BambooHR Account
You will need to add your BambooHR sub-domain
BambooHR API Access
Give BambooHR API access permissions (username and password)
Xero API Access
Give Xero API access permissions (username and password)
Xero Payroll
Provide Xero payroll clerk email id
Payment
Provide company credit card details for subscription setup