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 Connection

Connect BambooHR (paste an API key created by a BambooHR Full Admin)

Xero Connection

Connect Xero (secure sign-in with Xero; a user with Adviser role or higher and payroll access approves it)

Xero Payroll

Provide Xero payroll clerk email id

Payment

Add a card (or direct debit in Australia) to start syncing